Answer:
An organism, who if removed, the entire ecosystem changes
Explanation:
A keystone species is a species which has a disproportionately large effect on its natural environment relative to its abundance, a concept introduced in 1969 by the zoologist Robert T. Paine. Keystone species play a critical role in maintaining the structure of an ecological community, affecting many other organisms in an ecosystem and helping to determine the types and numbers of various other species in the community. Without keystone species, the ecosystem would be dramatically different or cease to exist altogether. Some keystone species, such as the wolf, are also apex predators.
Question 7 of 10
Which of the following is a way group behavior can help a human community
survive?
O A. Constructing housing
OB. Consuming more products
OC. Growing individual gardens
OD. Polluting the water supply
SUBMIT
Constructing housing. The correct option is A
What is Constructing housing ?Building and constructing residences or other sorts of structures meant for human habitation is referred to as housing constructing. Depending on the geography and the resources available, several materials and techniques might be used for building homes.
Building homes can fulfill a basic human survival requirement for shelter and protection from the elements. Group dynamics can also facilitate the sharing of information and assets needed for house construction, such as building methods and materials.
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Why should we consider using a variety of energy sources to meet our energy needs?
Diversifying the types of renewable energy used will allow systems to better meet the needs of local communities.
Each energy source provides a different kind of energy – some generate electricity while others provided liquid fuels for vehicles.
There is disagreement over which single source to go with because different factions back different energy sources.
Starting with windmills then switching to solar and geothermal if windmills are not cost effective will save money in the long term.
By using a variety of energy sources to meet our energy needs as each energy source provides a different kind of energy – some generate electricity while others provided liquid fuels for vehicles.
The amount of food energy required to maintain body size, body composition, and a level of necessary and desired physical activity consistent with long-term good health is known as energy needs.
Calculating energy needs can be done in a variety of ways. Take the athlete's weight in pounds and multiply it by ten to get a rough average of their basal needs, or needs without exercise.
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Select all that apply. People with high blood pressure should reduce their consumption of
fat.
protein.
sugar.
salt.
vegetables.
Hemoglobin is useful because it
A. transports oxygen with a higher efficiency.
B. transports carbon dioxide with high efficiency.
C. transports food molecules and releases them to cells in need of nutrients.
D. acts as a carrier for hormones.
E. All of the choices are correct.
a muscle contracting and pulling the hand away is shown by
The essential muscles that get worked during a Draw Up are the latissimus dorsi, trapezius, deltoids, rhomboids and pectoralis major; However, this exercise also involves many other smaller muscle groups.
When the thin actin and thick myosin filaments pass each other, muscle contraction occurs. Cross-bridges that extend from the myosin filaments and cyclically interact with the actin filaments during the hydrolysis of ATP.
Smooth muscles is a muscle that does most of the body's automatic work involuntarily. found in the walls of the majority of the body's tubular structures, such as blood vessels and the Gastrointestinal track.
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Zeke is working on a big project at work with his colleagues. Zeke's role is considered the Co-ordinator according to Dr. Belbin's Team Roles. What is MOST likely one of Zeke's main responsibilities?
Answer:
As a Co-ordinator according to Dr. Belbin's Team Roles, Zeke's main responsibility is to identify the talents of each team member and to delegate tasks accordingly.
Explanation:
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What all happens on Prophase 1 of Meiosis 1
There are 3 ways that meiosis and sexual reproduction lead to genetic variation. Explain those 3 ways
Crossing over
Independent assortment of homologous chromosomes
Random fertilization
rophase 1 is the first stage of meiosis 1, during which the following events occur:
Chromosomes condense and become visible as paired homologous chromosomes. Each chromosome consists of two sister chromatids held together by a centromere.
Non-sister chromatids of homologous chromosomes pair up and form a tetrad or bivalent.
Crossing-over occurs between non-sister chromatids of homologous chromosomes, resulting in exchange of genetic material between the homologous chromosomes.
The nuclear envelope breaks down, and spindle fibers attach to the kinetochores of the homologous chromosomes.
The three ways that meiosis and sexual reproduction lead to genetic variation are:
Crossing over: During meiosis 1, homologous chromosomes pair up and exchange segments of genetic material by crossing over. This creates new combinations of alleles on the chromosomes, leading to genetic variation in the resulting gametes.
Independent assortment of homologous chromosomes: During meiosis 1, homologous chromosomes align randomly on the metaphase plate, resulting in random segregation of maternal and paternal chromosomes into the daughter cells. This leads to a variety of possible combinations of chromosomes in the gametes.
Random fertilization: During sexual reproduction, any sperm can fertilize any egg. This leads to a random combination of alleles from the two parents, resulting in genetic variation in the offspring.
Answer:
Crossing over: As mentioned above, crossing over during prophase 1 creates new combinations of alleles on the chromatids. This means that each gamete will have a unique set of genetic information.
Independent assortment of homologous chromosomes: During metaphase 1, the bivalents line up randomly along the metaphase plate. This means that each gamete will receive a random assortment of maternal and paternal chromosomes. There are 2^n possible combinations, where n is the number of chromosome pairs (23 in humans).
Random fertilization: During sexual reproduction, any gamete from one parent can fuse with any gamete from another parent. This adds another layer of randomness to the genetic makeup of the offspring. There are 2^n x 2^n possible combinations, where n is the number of chromosome pairs (23 in humans).
Explanation:
Many scientific discoveries have contributed to the explanation of how life began on Earth. Which of the following was NOT used to develop this scientific theory?
Oparin's "primordial soup" theory was tested by Miller and Urey by passing sparks through a mixture of gases to represent lightning and within a week, several simple organic molecules had formed.
Louis Pasteur disproved spontaneous generation by showing that bacteria will not grow on meat in a sterilized environment.
Scientists supported Lynn Margulis' theory that eukaryotic organelles such as mitochondria and chloroplasts originated as prokaryotes that lived inside other, larger prokaryotic cells.
Darwin's argument that vestigial structures are evidence that evolution has occurred.
Darwin's argument that vestigial structures are evidence that evolution has occurred was not used to develop the scientific theory of how life began on Earth. The other three options are all relevant to the development of this theory. Oparin's theory proposed that the first living organisms arose from a mixture of organic compounds in the Earth's early oceans, and Miller and Urey's experiment supported this idea by demonstrating that these compounds could be formed through natural processes. Pasteur's experiments demonstrated that life does not arise spontaneously, which helped to reject the idea of spontaneous generation and support the theory of biogenesis. Margulis proposed the endosymbiotic theory, which explains the origin of eukaryotic cells and their organelles, and this theory is supported by scientific evidence.
mention the methods of drying fruits and vegetable?
Answer:
There are several methods for drying fruits and vegetables:
Sun-drying: This involves spreading the produce out in direct sunlight to dry naturally.
Oven-drying: This method involves placing the produce in a low-temperature oven to dry it out slowly.
Dehydrator: A dehydrator uses low heat and a fan to circulate air and remove moisture from the produce.
Air-drying: This method involves hanging the produce in a well-ventilated area to allow air to circulate and dry it out.
Freeze-drying: This method involves freezing the produce and then removing the water content through a process of sublimation.
Microwave drying: This is a quick method of drying small quantities of produce in a microwave oven.
The method used depends on the type of produce being dried, the available equipment, and the desired outcome.
(PLEASE HELP QUICKLY)
Marco’s little brother is watching a TV program about the gene that causes the genetic disease hemophilia. People with this disease cannot make a protein that is needed for blood to clot. After a few minutes, he turns to Marco and asks, “what exactly is a gene, anyway?”
Which of the following BEST describes a gene?
(A) A gene is a random change to an organism’s DNA.
(B) A gene is a structure in a cell that contains the cell’s chromosomes.
(C) A gene is made of DNA and contains the instructions for building proteins.
(D) A gene is a protein that makes up an organism’s structure and helps it function.
Answer:
(C) A gene is made of DNA and contains the instructions for building proteins.
Explanation:
7. In the Everglades, a system of canals and levees diverts water to urban areas and the Everglades National Park. This water management system has caused changes in
natural flow of the water during the wet and dry season. Wading birds are especially sensitive to wet and dry seasonal changes. How have water cycle disruptions MOST
affected wading birds?
O The release of water dilutes food sources for their young.
O The higher water levels allow longer-legged birds to survive and reproduce.
O The water quality for feeding has been improved by runoff.
The reduced salinity results in more eggs being laid.
Answer:
Explanation:
The water cycle disruptions have most affected wading birds by:The release of water dilutes food sources for their young.This is because wading birds depend on the natural flow of water to bring in fish and other small aquatic organisms which are a vital part of their diet. When the water cycle is disrupted by the canals and levees, the water flow changes, and the amount and timing of these organisms can be impacted, making it harder for wading birds to find food for their young. Therefore, option (a) is the correct answer.Option (b) is incorrect because longer-legged birds are not necessarily more adapted to survive in higher water levels.Option (c) is incorrect because water quality may not necessarily improve due to runoff.Option (d) is incorrect because reduced salinity may not be a direct cause of increased egg-laying.
_____ can cause acid deposition
Pour each bag of candy into a separate container or dish so you can see all the colors in each bag. Assign a letter to each color of chocolate candies and fruit candies, and record your key.
For example, red=R, purple=P
Without looking, randomly choose nine candies from each container one at a time. Using the letter symbols, record each candy as it is removed. Record your results using the following table. Example, R for red, Bl for blue, and so on.
Color
Color
Color
Color
Color
Color
Color
Color
Color
Number of different colors in total for this trial
Fruit Candy Trial 1
Fruit Candy Trial 2
Fruit Candy Trial 3
Chocolate Candy Trial 1
Chocolate Candy Trial 2
Chocolate Candy Trial 3
Count the number of species in each sample. Each color represents a different plant in the habitat.
Example: R, Bl, G, G, Y, Y, G, Bl, Bl has 4 species of plants (R, Bl, G, and Y).
You will then be dividing the # of different species (which is the # of different colors) in the next step.
Calculate the diversity index of both the bag of chocolate candies and fruit candies using the following formula for each trial.
Diversity Index = # of species
# of samples
Example:
R, Bl, G, G, Y, Y, G, Bl, Bl is 4/9 = 0.44
The # of species is 4 because there are 4 different colors.
Put the diversity index for each of the 6 trials in this table. This will always be a number less than 1, but more than zero.
Calculate the average from the three trials.
Diversity Index Table
Sample
Trial 1
Trial 2
Trial 3
Average
Fruit
Chocolate
Analysis (Make sure you scroll down to see all 7 questions.)
How did the diversity index values vary from the chocolate candies and fruit candies? Which habitat is the most diverse?
Why are communities that are more diverse usually more stable? Include resistance to disease and predation in your answer.
Assume two habitats have the same number of species. One habitat is predominantly one species with just a few of the other species. The other habitat has equal numbers of all the different species. Which will have the highest diversity index?
Why do you think the process was repeated three times?
There are many human-caused losses of biodiversity, such as habitat destruction and introduction of invasive species. Are there any natural events that could alter the diversity index?
How do invasive species change the diversity index?
What do you think would happen to a habitat if the plant diversity declines?
please help fast!!!!
thank you
Invasive species can potentially change the diversity index in a number of ways. They may come to an area where they have no natural predators, leading to overpopulation and rapid consumption of ecosystem resources.
Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats.
The impacts of alien invasive species at the ecosystem level include changes to trophic structures, changes in the availability of resources such as water and nutrients, and changes in the disturbance regimes.
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The European starling entered North Americe in the late 1800s. It proved very successful and was presented States by 1955. The survival or
reproduction of starlings MOST likely limited the population size of which organisme within thabiti?
its mutualists
its competitors
its decomposers
its predators
The success of the European starling in North America is most likely to have limited the population size of option b- its competitors, as they are likely to compete for the same resources such as food, nesting sites, and territory.
With the introduction of a new species that can exploit these resources, the competition becomes more intense, and the populations of other bird species may decline as a result.
The survival and reproduction of starlings may also indirectly impact the population size of predators, as they provide a new prey source for them to feed on. The impact on mutualists and decomposers is less clear, as they may not have a direct relationship with the European starling.
The introduction of European starlings to North America is likely to have had a negative impact on other bird species that compete with starlings for resources such as food, nesting sites, and territory.
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Although survivors felt strongly that the Holocaust be remembered so that it would not be repeated, they
were reluctant to share their experiences with their children. In fact, several of the adult children of study
participants asked the researchers for a copy of their parents' interview so that they could learn more
about their parents' Holocaust experience.
Explain why survivors of the Holocaust would want the world to know about what they
endured during the Holocaust, but not their children? Explain.
You are the senior software engineer at a start-up company developing an exciting new product that will allow salespeople to generate and email sales quotes and customer invoices from their smartphones.
Your company’s sales force has led a major corporation to believe your product will be available next week. Unfortunately, at this point, the software still contains quite a few bugs. The leader of the testing group has reported that all of the known bugs appear to be minor, but it will take another month of testing for his team to be confident the product contains no catastrophic errors.
Because of the fierce competition in the smartphone software industry, it is critical that your company be “first to market.” To the best of your knowledge, a well-established company will release a similar product in a few weeks. If its product appears
first, your start-up company will probably go out of business.
1. Should you recommend release of the product next week?
2. Who will benefit if the company follows your recommendation?
3. Who will be harmed if the company follows your recommendation?
4. Do you have an obligation to any group of people that may be affected by your decision?
5. What additional information, if any, would help you answer the previous
As a senior software engineer, I cannot recommend the release of a product with known bugs, as it could cause harm to users and damage the reputation of the company. Therefore, I would suggest delaying the release until the testing team is confident that the product is free of catastrophic errors.
If the company follows my recommendation, customers who purchase the product will benefit from a more stable and functional software product.
If the company releases a buggy product, customers could be harmed by losing trust in the product and potentially experiencing financial or other types of losses. The company's reputation could also be harmed, leading to potential harm to the company's employees and shareholders.
As a professional, I have an obligation to act in the best interest of the customers and the company. This means ensuring that the product is of high quality and meets customer expectations, even if it means delaying the release.
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which part of a list is most difficult to remember and thus requires additional practice
The middle part of a list is often the most difficult to remember and may require additional practice.
Why is a list important?A list is useful for organizing information, ideas, or chores in a clear and organized manner. It may also be used to remind of what has to be done or what has already been done. Lists are very useful when there are a lot of items to keep track of or a lot of information to recall.
This is known as the serial position effect, where items in the middle of a list are not as well remembered as items at the beginning or end of the list.
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Question #6
When building a phylogenetic tree, systematists look at which of the following sources of information? Select all that apply.
The type of information that is looked at by systematists is B. Genetic data.
What happens when building a phylogenetic tree?Systematists construct a branching diagram to depict the evolutionary history of organisms by using genetic data gathered from them when developing a phylogenetic tree.
This process involves analyzing DNA or protein sequences from various living organisms in order to identify similarities and differences that can be employed to group them into related lineages.
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Options are:
A. Fossil records
B. Genetic data
C. Behavioral observations
D. Weather patterns
Which of the following statements is NOT true? A. Cutting down trees affects the water cycle.
B. Ocean levels rise in an ice age.
C. Oceans hold most of the world's water. D. Clouds are formed because of cold temperatures.
Answer:
B. Ocean levels rise in an ice age.
Explanation:
During cold-climate intervals, known as glacial epochs or ice ages, sea level falls because of a shift in the global hydrologic cycle; water is evaporated from the oceans and stored on the continents as large ice sheets and expanded ice caps, ice fields, and mountain glaciers.
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Based on the understanding of the process of photosynthesis what are the strengths and weaknesses of this model
Answer:
The strength of the photosynthesis model is that it shows the complicated process that happens in different parts of the plant. However, a weakness of the model is that it oversimplifies the process and does not account for all of the factors that can affect photosynthesis, such as environmental conditions or plant genetics.
Pls Help I need help, I need a drawing of model
Throughout human existence we have relied on the oceans – for food, as a waste dump, for recreation, for economic opportunities and so on. However, it’s not only our activities in the marine environment that affect life in the sea – it’s also the things we do on land.
It is hardly unexpected that our actions are having an impact, given that more than half of the world's population currently resides within 100 kilometers of the coast. With our quick population growth, major technological advancements, and huge changes in land usage, human impacts have risen. New Zealand is not an exception when it comes to the effects of overfishing, pollution, and alien species on marine life.
The ocean and the creatures that dwell there are coming under growing pressure from human activity, both at sea and on land.
The ocean has probably always provided sustenance for people who live near the coast. However, many fish stocks all around the world have decreased dramatically as a result of improvements in fishing gear, bigger ships, and new tracking technologies. Many people now believe that the fish populations on the continental shelf have been over- or totally fished. Unsustainable fishing methods can harm the marine environment in other ways besides diminishing fish stocks. For instance, certain fishing methods like trawling and dredging can significantly harm marine habitats and creatures that live on the sea floor. Additionally, bycatch, or non-target species, are frequently caught using these approaches and discarded.
Unsustainable fishing practices refer to the use of different fishing techniques to catch or harvest fish at a rate that causes fish populations to decline over time.
Thus, In addition to being used as a technique for overfishing, which causes fish populations to decline at a rate that cannot be sustained, these tactics are seen to enable the destructive fishing practices that devastate ocean ecosystems.
These unsustainable fishing techniques can be carried out using anything from consumer-level gear like fishing rods and nets to commercial-grade machinery like bottom trawling.
These fishing techniques are not sustainable since they are used in conjunction with rising fishing demands brought on by social behaviors like over-exploitation and over-fishing.
Thus, Unsustainable fishing practices refer to the use of different fishing techniques to catch or harvest fish at a rate that causes fish populations to decline over time.
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An example of a Climate Change scenario
Answer: global warming
Explanation:
A climate change scenario could involve a city experiencing an increase in extreme weather events, such as hurricanes, floods, and droughts.
The rising global temperatures caused by increased greenhouse gas emissions from human activities can contribute to these extreme weather patterns.
As a result, the city may need to invest in infrastructure to withstand the impacts of these events, such as building sea walls to protect against flooding and implementing water conservation measures during droughts.
In addition, the city may need to adapt its emergency response plans to address the increased frequency and severity of these extreme weather events. This is just one example of a potential climate change scenario that could impact a community.
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Identify and label the following stages of meiosis:
What are the two phases of Meiosis and their sub-phases
In sexually reproducing organisms, meiosis is a kind of cell division that results in the production of gametes, or sex cells. Meiosis I and Meiosis II make up the two phases of the process. The reduction division is another name for meiosis I, which is the first stage of meiosis.
Each chromosome is replicated and the number of chromosomes is halved during this phase. Following replication, the chromosomes couple off and cross over to exchange genetic material. Four daughter cells are created as a result of this process, each of which has half as many chromosomes as the parent cell.
The equational division is another name for meiosis II, the second stage of meiosis. The replicated chromosomes separate during this phase, and the cell divides.
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how can secondary response be artificially prompted
The secondary response can be artificially prompted by injecting a recipient with exogenous antibodies.
How can a secondary immune response be artificially induced?The response can be induced in differnt ways such as through the naturally by transplacental transfer of maternal antibodies in a case whereby one is dealing with a developing fetus,.
It should be noted thta this can be done by injecting a recipient with exogenous antibodies hoever the secondary immune response can be seen as the important features of immune systems this is due to the fact that the the immune system can eliminate the antigen especially in the case of primary invasion.
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How would a change in soil bacteria affect an ecosystem?
Answer: A change in soil bacteria could have a significant effect on an ecosystem. Soil bacteria play an important role in the cycling of nutrients and energy within an ecosystem. Bacteria help break down organic matter, releasing essential nutrients into the soil which can then be taken up by plants. They also help to convert nitrogen from the atmosphere into a form that can be used by plants. As a result, a change in soil bacteria could impact the availability of nutrients, the rate of decomposition, and the amount of energy and carbon cycling within an ecosystem. This could have a ripple effect on the entire ecosystem, potentially affecting the populations of plants and animals and their interactions with each other.
Explanation:
Directions: In the space below, draw and label the Trichoplax adhaerens using the directions in the slideshow that appears on the page where your accessed this worksheet. Your labeling should include the dorsal surface, cover cells, the ventral surface, cylinder cells, gland cells, fiber cells, and cilia.
Trichoplax adhaerens is a small, flattened, and ciliated animal belonging to Placozoa phylum. Its body is a few millimeters in size and has a simple, two-layered structure, with an outer layer of cover cells and an inner layer of cylinder cells.
Thus, the different structures of Trichoplax adhaerens include dorsal surface which is the upper surface facing upward. Then, cover cells are present which is the outermost layer of cells that cover the animal body.
Ventral surface in Trichoplax adhaerens is the lower surface of the animal facing downward. Cylinder cells are the inner layer of cells lining the digestive cavity of the animal.
Gland cells are the cells that secrete enzymes for digestion in Trichoplax adhaerens. Fiber cells help to maintain the shape of the animal and cilia are hair-like structures covering the surface of the animal.
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Which of the following recommendations can help prevent sharps injuries? (Select 2 correct answers):
a. Wear an N95 mask whenever using sharps
b. Minimise sharps handling and avoid passing sharps by hand
c. Dispose of the sharps containers before they are half full
d. Dispose of sharps into an approved yellow clinical waste bag
e. Do not recap sharps of. Dispose of sharps into an approved plastic sharps container, which is usually green in colour.
The recommendations can help prevent sharps injuries are
b. Minimise sharps handling and avoid passing sharps by hande. Do not recap sharps of. Dispose of sharps into an approved plastic sharps container, which is usually green in colour. Why the two options are to prevent sharps injuriesThese two vital answers, b and e, highlight the necessity of lessening the manipulation of sharps, as well as guaranteeing their suitable disposal into accepted sharps holders, which are fundamental principles in hindering sharps injuries in medicinal precincts and other environments.
It is essential to obey validated directions, policies, and approved conventions for sharps protection to protect healthcare personnel and individuals from the possible menace caused by sharps traumas.
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What is the definition of a scientific theory?
A.
The final outcome of an experiment completed one time.
B.
A proposed explanation for an occurrence based on available data, observations, or evidence.
C.
A well supported explanation of why a phenomenon occurs.
D.
A scientifically acknowledged principle that has been confirmed by repeated experimental observations.
Answer:
D
Explanation:
A scientifically acknowledge principle that has been confirmed by repeated experiment observations.
The height, h, in centimeters of a species of mammal that is t years old can be modeled by the equation below.
h = 37.8(2.07t)^1/3 + 78.6
What is the best interpretation of (2.07t)^1/3?
A. the product of 2.07, the age of the mammal, and one-third
B. the product of the cube root of 2.07 and the age of the mammal
C. the product of 2.07 and the cube root of the age of the mammal
D. the cube root of the product of 2.07 and the age of the mammal
The best interpretation is going to be: the product of 2.07 and the cube root of the age of the mammal.
How to get the interpretation hereThe mathematical statement (2.07t)^1/3 employs an exponent of 1/3 to carry out the cube root operation, where t indicates the age of a mammal as measured in years.
To break down the expression step by step:
Multiply 2.07 by the age of the mammal (t): 2.07tTake the cube root of the result from step 1: (2.07t)^(1/3)Therefore we have the product of 2.07 and the cube root of the age of the mammal
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What does the moon not have on its own?
O rotational period
O gravity
O revolution period
Olight