Answers
The two sentences that describe what scientists have discovered about red algae and sponges are:
B. Biomarker evidence of sponges has been found in rocks that date back to the great oxidation event, while evidence of red algae appeared long after the event.
D. The earliest fossil evidence of multicellular life is of red algae, while the earliest fossils of sponges, also multicellular, appeared much later.
Scientists have discovered biomarker evidence of sponges in rocks that date back to the great oxidation event, while the earliest fossil evidence of multicellular life is red algae.
Hence options B and D are correct.
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Related Questions
some mice have inherited a genetic mutation that causes them to have a band of white fur around the middle of their bodies. what is most likely true about an ancestor of these mice?
Answers
If some mice have inherited a genetic mutation that causes them to have a band of white fur around the middle of their bodies, it is most likely that an ancestor of these mice also had the same genetic mutation that caused the band of white fur.
Genetic mutations are changes in DNA sequence that can be inherited by offspring from their parents. If a mutation passed down from the parent to its offspring, then next generations will also have the same mutations. The white fur band presence suggests that the mutation for this trait has been inherited through multiple generations of mice.
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Label the parts of the muscle tissue as indicated in the image.
Answers
The labeled parts of the muscle tissue as indicated in the image are found in the attachment.
What is muscle tissue?Muscle tissue is made up of cells with the unique capacity to shorten in order to cause movement of the bodily components. The tissue is packed with blood vessels and has a high cell density.
Cardiac, smooth, and skeletal muscle tissue are the three types.
Cardiac muscle cells are found in the walls of the heart, have a striated appearance, and are controlled by an automatic mechanism.
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4. Hideki rolls up a paper towel and puts it in a straw. He puts one end of the straw in a glass of water and observes the movement of the water from the glass up the towel.
Which statement best describes what Hideki has made a model of?
A. It shows the pathway of water from the leaves of a plant to the stem.
B. It shows the pathway of water from the leaves of a plant to the roots.
C. It shows the pathway of water from the roots of a plant through the stem.
D. It shows the pathway of water from the roots of a plant directly to the leaves.
Answers
PLEASE HELP IVE BEEN STUCK ON THESE TWO QUESTIONS FOR A LONG TIME
Answers
Answer: honestly it really depends on the water and how its dripped
Explanation:
Which sentence describes the impact of the great oxidation event?
Answers
The correct statement is "It caused many organisms to die off" because oxygen was toxic to them.
Option (b) is correct.
The Great Oxidation Event refers to the period of time approximately 2.4 billion years ago when oxygen began to accumulate in the Earth's atmosphere due to the evolution of photosynthetic organisms like cyanobacteria.
This event had a significant impact on the evolution of life on Earth, as the presence of oxygen allowed for the evolution of aerobic respiration, which is much more efficient than anaerobic respiration. However, the sudden increase in oxygen also caused many anaerobic organisms to die off because they were unable to tolerate the presence of oxygen,
Therefore, the correct answer is option B
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Match the descriptions below to the correct type of muscle.
spindle-shaped
attached to bones
voluntary
cells joined together by intercalated discs
not striated
found in heart
cells with many nuclei
Answers
The three types of muscles are skeletal, cardiac, and smooth muscles. Skeletal muscles are attached to bones, they are also voluntary, meaning they can be consciously controlled by the individual. They have cells that have many nuclei, making them multinucleated.
Cardiac muscles are found in the heart and their cells are joined together by intercalated discs. They are involuntary, meaning they cannot be consciously controlled. Smooth muscles are not striated, they are spindle-shaped, and also involuntary. They are found in various organs and tissues, such as the digestive system and blood vessels.
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Please help, I keep getting 8/9 of these right. Future global warming is expected to cause:
Answers
Answer: More frequent wildfires
Stronger, longer-lasting droughts over all of the U.S
Explanation: Warmer weather causes more dry soil and vegetation, leading to more wildfires.
functions of viruses
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1. Replication: Viruses are capable of replicating themselves within a host cell.
2. Transmission: Viruses can spread from one host to another, either through direct contact or through a vector such as a mosquito or tick.
3. Disease: Viruses can cause a variety of diseases in humans, animals, and plants.
4. Evolution: Viruses can evolve over time, leading to the emergence of new strains that may be more virulent or resistant to treatment.
5. Research: Viruses are often used in research to study basic biological processes, develop new treatments, and create vaccines.
Answer:
reproduction to make copies of itself.ecological regulation of lake carbon cycling process.they drive microbial evolution.influence global biogeochemical cycles .to deliver it's genome into the host cell to allow it's expression (transcriptipn and translation) by the host cell.Before Darwin's theories, scientists thought that species….
O never changed
O Changed over time
O Changed only randomly
Answers
Answer:
Never changed.
Explanation:
Before Darwin's theories, scientists thought that species never changed. This concept was commonly known as the doctrine of "fixity of species," which posited that species were immutable and remained unchanged since their creation. According to this belief, species were considered to be fixed entities with no potential for an evolutionary change or adaptation to their environment. This view was deeply entrenched in the prevailing scientific and religious beliefs of the time, and it was not until Darwin's groundbreaking work on natural selection and the theory of evolution that this long-held notion was challenged and replaced with the understanding that species do indeed change over time through the process of natural selection and other mechanisms of evolution.
2. In Albinism, no pigmentation is produced in the skin, hair, and eyes. This is due to a
mutation for the gene that produces the enzyme tyrosinase which produces melanín.
Albinism is a recessive trait. Two heterozygous parents (Aa), both with normal
pigmentation, mate. What are the chances that their offspring will be albino? Show
your Punnett squares & results.
Answers
Only 25% of the offspring of the parents would be seen to show albinism.
What is albinism?Albinism is a rare hereditary disorder brought on by gene abnormalities that impact how much melanin your body generates. The pigmentation (color) of your skin, eyes, and hair is regulated by melanin. Albinism is characterized by abnormally pale skin, eyes, and hair.
Based on the information given, there is a 25% chance that their offspring will have albinism (aa genotype).
Therefore, the probability of their offspring having albinism is 25%, which means that for every 4 children born to these parents, one is expected to have albinism.
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How many oxygen atoms are involved in the reaction below?
C6H12O6 + 602 6H₂O + 6CO₂
Answers
Explanation:
24 oxygen atoms are in the products of the reaction.
6. Make Models Develop a taxonomic key that
a person could use to identify the following ani-
mals: hawk, alligator, duck, snake
Answers
Dichotomous keys are classification tools used to identify taxonomic groups based on distinctive traits. You will find the taxonomic key in the text below.
What is a dichotomous key?
A dichotomous key might be considered a significantly useful tool to classify organisms. The key provides an easy and fast way for identification by describing different morphological traits, leading you to the correct taxonomic classification.
The key provides morphological descriptions about different taxonomic groups in an easy way to identify these traits in your individual.
A dichotomous key will always provide two options (a and b, or 1 and 2), and you will have to choose one of them according to the characteristics of your organism. The morphological descriptions are made in order to discriminate groups.
In the exposed example, we have four animals. Let us analyze their characteristics.
A hawk has feathers, two legs, two wings, claws, hooked peakAn alligator has scames, four legs, no wings, small claws, several sharped teeth.A duck has feathers, two palmate legs, two wings, no claws, plane peakA snake has scames, no legs, no wings, no haws, several sharped teeth.Now. with these descriptions we can make the classification tool.
1) a- It has feathers --------------- go to 2
b- It has scames ---------------- go to 3
2) a- It has claws, a hooked peak, and unpalmate legs -------- Hawk
b- It has a plane peak and palmate legs --------------------------- Duck
3) a- It has four legs ------------- Alligator
b- It does not have legs -------- Snake
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Please use page 432 of the course text book to answer teh following questions (Ignore the current screen I have 25 minutes left)
13.91
gland
13.92
13.93
13.94
13.95
13.96
13.97
13.98
13.99
13.100
males
glands
gland
gland
of the female
gland
glands
islets
of the
A. pancreatic islets
B. testicles
C. pituitary
D. adrenal
E. thyroid
F. ovaries
G.hypothalamus
H. thymus
1. pineal
J. parathyroid
Answers
Pancreatic islets are groups of cells found within the pancreas that synthesize hormones like insulin and glucagon. Testicles constitute male reproductive organs which produce testosterone, a key hormone for enhancing masculine features.
How to explain the partsSituated at the base of the brain, pituitary gland plays a pivotal role in producing as well as equilibrating the secretion of various hormones that affect other endocrine glands. Adrenal glands perched atop kidneys produce essential hormones - adrenaline and cortisol to meet stressful environments while reducing inflammation or immune response.
The thyroid presides over the neck region; its major function lies in generating notable hormones that help adjust metabolism including growth rates. On the other hand, ovaries serve as female reproductive organs responsible for estrogen production besides regulating other imbalances.
Hypothalamus, located centrally inside the skull, governs effective release and prompt regulation of hormones from the pituitary gland, consequently ensuring balanced activity within the body. Thymus is located close to the chest area, generally empowering stable maintenance and nourishment of healthy immune systems.
Pineal gland characterizes a smaller gland nested deeply inside the human brain tasked with furnishing the natural sleep cycles via melatonin hormone secretion. Parathyroid glands, comprising four small nodules attached around neck structure, effectively contribute to Calcium homeostasis by promptly releasing Parathyroid hormone into bloodstream when required.
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Prior Knowledge... The INITIAL rise in the line of the graph is an example of * 1 point population growth in a species as a result of? Use the graph to answer the question below.
A. a decrease in biodiversity
B. an increase in food supply
C. a decrease in habitat Time
D. an increase in natural predators
Answers
The initial rise in the line of the graph is an example of population growth in a species as a result of B. an increase in food supply.
Why does food increase in a habitat?Seasonal changes, prey species mobility, a decrease in natural predators, an increase in prey species reproductive rates, and human activities such as farming and hunting can all cause food to increase in an environment.
Moreover, meteorological factors such as temperature, rainfall, and nutrient availability can influence plant growth and, as a result, herbivorous animal food availability.
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you and your friend in the school yard. you rest your ear against a metal leg of the swings while your friend gently taps on the leg. you hear the tapping. describe the wave produced bt tapping. is it a longitudinal wave or a transverse wave? Draw a model of the wave.
Answers
The wave produced by tapping on the metal leg of the swings is a longitudinal wave. Longitudinal waves have oscillations that occur parallel to the direction of wave propagation.
When your friend taps on the metal leg, it causes compression in the material. This compression then travels through the metal as a wave, with successive compressions and rarefactions. As the wave reaches your ear, it causes your eardrum to vibrate, and you perceive the tapping sound.
| | | | |
C R C R C
| | | | |
The "C" represents compression, and the "R" represents a rarefaction. The wave propagates from left to right, with each compression and rarefaction alternating in sequence. As you rest your ear against the metal leg of the swings, you are able to detect the longitudinal wave as it travels through the metal and into your ear.
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A specific characteristics such as a seed color or plant height that varies from one individual to another
Answers
Answer:
Phenotype
Explanation:
Phenotype refers to an individual's observable traits, such as height, eye color and blood type.
1. 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.
Answers
A gene can be described as being made up of DNA and it contains the instructions which are required for the building of the proteins.
The correct option is option C.
Genes are basically considered as the the functional units of heredity as they are basically composed of DNA, which is the nucleic acid responsible of the transmission of information from one generation to the other generation.
The chromosomes which are present in our body are basically made up of DNA which contain a number of genes. Each of the gene basically comprises of certain set of instructions which are required in order to perform a particular function or codes for some proteins.
Hence, the correct option is option C.
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3. Critique At lunch, your friend stated that her
apple was a living thing, because if she put a
piece under the microscope, she'd see cells.
How will you respond?
Answers
I would respond by acknowledging that indeed an apple does have cells, but that does not necessarily make it a living thing. While it is true that living things have cells, there are other criteria that must be met in order for something to be considered living.
Living things are characterized by their ability to grow, reproduce, respond to stimuli, and maintain homeostasis. An apple, on the other hand, does not have the ability to do any of these things. It cannot grow or reproduce, nor can it respond to stimuli or maintain homeostasis.
Additionally, while an apple does contain living cells, those cells are not actively carrying out the functions necessary for life. They are essentially in a state of suspended animation until the apple begins to decompose.
Overall, while it is understandable that someone might assume an apple is a living thing due to the presence of cells, a more comprehensive understanding of what constitutes life would lead one to conclude otherwise.
PART B: Compare the genetic variation of the smaller population with the genetic variation of
the original population. Identify the vocabulary term that most specifically describes this form of
genetic drift. (Is it population bottleneck or the founder effect?)
Answers
The genetic variation of the smaller population will be reduced compared to the original population.
The vocabulary term that most specifically describes this form of genetic drift is the founder effect.
What happens to small populations overtime?Small populations are more liable to genetic drift, which can lead to loss of genetic variation and increase in frequency of certain alleles. This can reduce the genetic diversity of the population and increase its likelihood to inbreed, resulting in the expression of deleterious recessive alleles.
Reduction of smaller population is because the smaller population is a part of the original population and only a few number of individuals from the original population contribute their own genes to new population.
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which statement best describes the nucleaus a.)to hold a plants cells DNA b.)to hold a plants cell DNA c.)to hold all types of cells DNA D.)to hold both plants and animals cells DNA
Answers
Answer: B
Explanation:
I need help please
FORREST GUMP Discussion Response
What is the most important scene, shot or moment? How is this relevant to the film?
How did Forrest's participation is significant historical events affect his personal outlook on life (and extend to other characters around him)?
How did the CGI effects contribute to creating a believable environment?
Justify your response, citing SPECIFIC examples or scenes from the film.
Answers
Select the statement(s) that accurately describe a parasite.
The largest of the infectious agents
Are usually easier to diagnose and
treat
Usually a chronic or life-long infection
Look like small insects
Can be internal or external
Answers
The statement that accurately describes a parasite is that they are the largest of the infectious agents and can be internal or external. That is option A and E.
What is a parasites?A parasite is a type of microorganism that has the ability to live in or on the host while deriving it's food in the expense of the host.
Other microorganisms which can only be seen with the aid of the microscope are virus, bacteria, fungi while most of the parasitic worms can be seen without the use of microscope.
A parasite can be found within the body systems such as the blood and gastrointestinal tract while some can be found out side the body of the host.
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Explain Phenomenon
You observe many
mushrooms growing in a circle. How many
organisms are you likely seeing? Explain.
Answers
The phenomenon of observing many mushrooms growing in a circle is known as a fairy ring or elf circle.
The number of mushrooms growing in the elf circle depends on the species of the mushroom.
What is an elf circle?Fairy rings, often referred to as elf rings or pixie rings, are circles composed of mushrooms that appear in nature.
Some mushrooms are small, while others can reach a diameter of 600 meters as they emerge from the earth in a circular pattern. One of the most wonderful places in the woods are fairy rings.
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Directions: Answer the following questions in your own words using complete sentences. Do not copy and paste from the lesson or the internet.
1. Identify traits that characterize all animals.
2. State one way that animal cells differ from the cells of plants and fungi. What is the significance of this difference?
3. Describe a general animal life cycle.
4. State how the phylum Chordata differs from other animal phyla.
5. List three traits that evolved in invertebrate animals.
6. Describe the range of variation in the nervous systems of invertebrates.
7. Distinguish among asymmetry, radial symmetry, and bilateral symmetry.
8. Define cephalization. What is its relationship to bilateral symmetry?
9. What is mesoderm? Name an invertebrate with mesoderm.
10. Define coelom. How is the coelom related to the hydrostatic skeleton?
11. What is segmentation? Why is it adaptive?
12. Describe evidence showing that echinoderms are more closely related to chordates than are other invertebrate phyla.
Answers
Every animal has specialized tissues and is a eukaryotic, multicellular entity.
Animal cells don't have a cell wall, in contrast to the cells of plants and fungi. Animal cells have flexibility as a result. It enables them to adopt various forms, so they can specialize to perform specific tasks.
Animals are born as eggs or living creatures, develop into adulthood, and then mate. Animals either hatch from an egg or are born as young, prepared for life.
The existence of a notochord, a dorsal, hollow nerve cord, and pharyngeal slits (also known as gill slits) are the four most notable traits that set chordates apart from animals in all other phyla.
Three key characteristics in the evolution of invertebrates are symmetry, specialization, and cephalization.
Cephilized invertebrates, which have brains, may also only have nerve nets.
Radial symmetry, in which body components are arranged around a central axis, and bilateral symmetry, in which organisms may be divided into two nearly identical halves along a single plane, are the two basic types of symmetry. A few organisms exhibit asymmetry, or complete lack of body plane symmetry.
The mouth, sense organs, and nerve ganglia get concentrated in the front of an animal over many generations, creating a head area. This is known as cephalization. This is connected to mobility and bilateral symmetry, resulting in a distinct head end for the animal.
The mesoderm, is a germ layer that emerges during gastrulation, found between the ectoderm, which will develop into skin and cells of the central nervous system.
The coelom, a cavity inside the body that is filled with fluid, acts as the organism's hydrostatic skeleton.
An organism can move across segments while having its delicate organs protected from harm. An organism's capacity to segment functions into various body parts enables it to carry out ever-more complicated actions and utilize various body parts for a variety of roles.
Since echinoderms are deuterostomes, they are linked to practically all other invertebrate phyla more distantly than they are to chordates, which includes ourselves.
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42 Janie needs pencils sharpened for her students to use on their test tomorrow. Janie thinks that a special snack will increase the. productivity of workers. She creates two groups of 25 workers each. and assigns each group the same task, in this case, they're supposed to sharpen pencils. Group B is given the special snack to eat while they work. Group A is not given the special snack. After an hour, Janie counts how many pencils are sharpened by each group. Group B sharpened 204 pencils, Group A sharpened 158 pencils. What are some constants in this experiment? A Group A B Group B number of pencils sharpened D) Janie needed pencils sharpened E) If I give the workers a snack then they will work faster F pencil sharpeners, the workers, all worked for one hour C G snack vs. no snack H) The snack increased worker productivity (it worked)
Answers
Some of the constants in the experiments are;
F) Pencil sharpeners: Both groups used the same tool to sharpen pencils.
G) The workers: Both groups had the same number of workers (25 each).
E) All worked for one hour: Both groups had the same amount of time to complete the task.
What are constants in experiements?In experiments, constants are those variables that are kept the same or held constant throughout the experiment.
The constant variables help to know whether any observed changes or effects can be attributed to the variable being tested, rather than other factors.
By controlling these the constant variables, scientists can then reduce the things that could be a source of error in their research and increase the accuracy and reliability of their results.
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Drag the labels to the correct location on the Punnett square. Not all labels will be used.
In the pea plant, the allele for green pod color (G) dominates the allele for yellow pod color (g). The Punnett square illustrates a cross for this trait
Which offspring can be described by the GG and gg genotypes in the table?
mentum. All rights reserved.
homozygous
offspring with
yellow pod color
G
g
homozygous
offspring with
green pod color
heterozygous
offspring with
yellow pod color
G
GG
Gg
g
Gg
99
C
56°5
C
Answers
The offspring can be described by the GG and gg genotypes are the homozygous dominant and the homozygous recessive genotypes offspring.
What are homozygous genotypes?Homozygous genotype refers to having two identical copies of the same gene—one inherited from the mother and one from the father—that are present. Either both genes in a homozygous genotype are normal or both genes share the same mutation.
Having identical alleles for just one attribute is what is meant by being homozygous. When two identical copies of a gene are present, you are said to be homozygous for that gene.
An example is the GG and the gg genotypes which are homozygous dominant and the homozygous recessive genotypes.
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Scenario: What 2 systems are working together? Horned lizards have a defense mechanism that includes shooting blood from their eyes. The major veins surrounding the eye of the lizard are controlled by muscles. When the lizard contracts these muscles, blood flow is increased to the head. As a result, a specialized membrane similar to an eyelid fills with blood. Muscles in the eyelid and eye contract to shoot blood when predators approach. Scientists believe the blood deters predators.
Answers
The two systems that are working together in this scenario are the circulatory system and the muscular system. The circulatory system, which includes the heart, blood vessels, and blood, is responsible for transporting oxygen and nutrients throughout the body. In the case of the horned lizard, the circulatory system is involved in supplying blood to the area around its eyes.
The muscular system is responsible for the movement of the body and the maintenance of posture. In the case of the horned lizard, the muscular system controls the major veins surrounding the eye and is responsible for contracting the muscles to increase blood flow to the head. The muscles in the eyelid and eye also contract to shoot blood when predators approach.
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Which part of the brain is composed
of the frontal lobe, the parietal lobe,
the occipital lobe, and the temporal
lobe?
A. the brain stem
B. the cerebellum
C. the cerebrum
Answers
Answer: The cerebrum
Explanation:
The cerebrum consists of two cerebral hemispheres the outer layer called the cortex (gray matter) and the inner layer (white matter). There are four lobes in the cortex, the frontal lobe, parietal lobe, temporal lobe, occipital lobe.
PLEASE HELP ME PLEASEEEE!!!!!!
This is about finches: What is an environmental condition that you can think of that could act as a “selection agent” for choosing the most beneficial traits of a species to move into the next generation?
Thank you :)
Answers
One case of an natural condition that can be use as a selection agent for choosing the the most beneficial traits of a species to move into the next generation is the availability of nourishment.
How is availability of nourishment beneficial to traits of a species as a selection agent?Within the case of finches, the estimate and shape of their bills are vital for their capacity to get nourishment.
Assume there's a populace of finches living in an zone where the essential nourishment source comprises of hard-shelled seeds. Finches with bigger, more grounded snouts would be superior able to split open these seeds and get the supplements interior. Over time, this natural condition would act as a determination specialist, favoring people with bigger, more grounded snouts, and driving to the transmission of these useful characteristics to the another era.
So also, in case the essential nourishment source comprises of littler, milder seeds, finches with littler, more sensitive noses would be superior adjusted to get and devour this nourishment. In this case, the natural condition would select for people with littler, more sensitive snouts, and these characteristics would be passed on to future eras.
Other natural variables, such as climate, predators, and illness, can too act as choice operators and shape the advancement of a species over time.
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Which of the following organisms would NOT be in the first tropic level of an energy pyramid? Responses dog tree gas
Answers
Answer:
dogs
Explanation: