Answer:
26 million years ago
Explanation:
About 0.55 million or 550,000 years ago the earliest South Asian river dolphin evolved.
About 0.5 million years ago the South Asian dolphin evolved due to different environmental conditions. South Asian dolphin have very flexible necks due to no fusion of their neck vertebrae. They are using echolocation to navigate and search for prey.
Research indicates that South Asian dolphin diverged from a common ancestor around 550,000 years ago that lives in the Indus and Ganges basins so we can conclude that the South Asian dolphin evolved around 0.55 years ago.
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What is the most important part in the respiratory system?
The lungs.
The lungs are paired, cone-shaped organs which take up most of the space in our chests, along with the heart. Their role is to take oxygen into the body, which we need for our cells to live and function properly, and to help us get rid of carbon dioxide, which is a waste product.
Which of the following averages for temperature would best reflect an area’s climate?
Select one: Plz help NO LINKS Plz
Average temperature over 30 years.
Average temperature over three days.
Average temperature over three months.
Average temperature over three years.
Explanation:
average temperature over 30 years
hope it may help you
How many paths through which charge can flow would be shown in a circuit diagram of a parallel circuit? more information is needed. none two or more one
Answer: More than 1
Explanation:
A parallel circuit is defined by having more than one path through which current can flow. This is in contrast to a Series circuit where the current flows through just one path.
Even though there are multiple paths for the current to flow through, the current flowing through all the paths must add up to the total current that is being supplied from the source.
which type of blood vessel normally contains valves to keep the blood flowing in One Direction
a) arteries
b) veins
c) capillaries
B) Viens
The veins have valves to keep the blood pumping out and not coming back in the heart.
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Answer:
2nd one is the most realistic of what occurs in ecosyystems
Which of the following is NOT true about Earth’s systems? A.Together, the the geosphere, hydrosphere, atmosphere, and biosphere work to support life on planet Earth. B. Our atmosphere is the place that holds our oxygen. C. There are many systems, or, parts, that work independently. D. There are many , systems, or parts, of the Earth that work together.
Answer:
d
Explanation:
because each part and system as individual tasks or ways to help the earth
The statement that is not true is that there are many systems, or, parts, that work independently. The correct option is C.
What is Earth's system?The application of systems science to the Earth is known as earth system science. It focuses on interactions and 'feedbacks' in particular.
The five Earth systems interact to create the environments we are familiar with.
Everything in the Earth's system can be classified as either land, water, living things, or air. These four components of the system are referred to as "spheres."
They are the "lithosphere" (land), the "hydrosphere" (water), the "biosphere" (living things), and the "atmosphere" (air).
The geosphere is split up into four subsystems: the lithosphere, hydrosphere, cryosphere, and atmosphere.
Because these subsystems interact with one another and with the biosphere, they work together to influence the climate, trigger geological processes, and influence life on Earth.
Thus, the correct option is C.
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When a filament of algae is illuminated with light that is passed through a prism, different segments of algae are exposed to different wavelengths of light. When aerobic bacteria are present, they congregate in highest concentrations in the areas illuminated by the red and blue light. These data suggest a relationship between which of the following variables?
a) Wavelength of light and rate of aerobic respiration
b) Wavelength of light and amt of heat released
c) Wavelength of light and the rate of photosynthesis
d) Carbon dioxide concentration and the rate of photosynthesis
Answer:
The correct answer is C) wavelength of light and rate of photosynthesis.
Explanation:
The given question is a famous experiment conducted by T W Engelmann which is called the action spectrum experiment. In this experiment when light passes through a prism it splits into its constituent colors splits into violet, indigo, blue, green, yellow, orange and red.
Aerobic bacteria require oxygen for their survival. The green algae produce oxygen during photosynthesis. Engelmann released aerobic bacteria to it. it is found that the bacteria accumulated at the blue and red light because photosynthesis and oxygen release were higher there. So, it establishes the relationship between the wavelength of light and photosynthesis.
A farming method that involves creating and planting small flat areas on the sloping sides of hills or mountains is called ________.
A.
terracing
B.
contour farming
C.
crop rotation
D.
erosion
Answer:
A
Explanation:
I learned this in class. Hope this helps! :D
The soil in rainforest are_________
Question options:
mediocre
rich in clay
nutrient rich
nutrient poor soil
Answer:
Nutrient poor soil
Explanation:
Because rainforest have very poor infertile.The soil also contains Less organic.
Or for simple answers wet forest bad, dry and healthy forest is good.
The soil in rainforest are nutrient poor soil.
What is Soil?In soil science, a soil type is a taxonomic unit. A distinctive soil type is made up of all soils that have a certain set of well-defined features in common.
The phrase "soil type" refers to the study of soil classification, which is concerned with the orderly classification of soils. Every soil on the planet is a particular soil type.
Minerals, soil organic matter, living organisms, gas, and water are the five components that make up soil. Clay, silt, and sand are the three size classes for soil minerals.
The majority of soil types in hierarchical soil classification schemes are in the higher or intermediate level.
Therefore, The soil in rainforest are nutrient poor soil.
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Look at the laboratory setup below. What would this laboratory setup most likely be used to demonstrate?
A
carbohydrate synthesis
B
active transport
C
diffusion
D
dehydration
Answer:
diffusion
Explanation:
A machine that changes only the direction of a force has a mechanical advantage of ____.
a.
1
c.
10
b.
2
d.
100
Please select the best answer from the choices provided
A
B
C
D
All organisms' cells contain DNA. Every organism's DNA is made of nucleotides. Although, the four species on this phylogenic tree are different, which components of their DNA are the same? Species = Human , Chimp, Gorilla, Orangutan
A = sugar deoxyribose and the base thymine.
B= sugar deoxyribose and the base uracil.
C= sugar ribose and the base thymine
D= sugar ribose and the base uracil.
Answer:
A = sugar deoxyribose and the base thymine.
Explanation:
DNA is the storage molecule of the genetic information in almost all cells of living organisms. DNA is one of the two types of nucleic acids, a biological polymer made up of monomeric units called NUCLEOTIDES.
Nucleotides of a DNA are composed of three major substances that make up its structure. The three components are; a pentose sugar (deoxyribose), phosphate group and nitrogenous bases, which can be Adenine, Thymine, Guanine and Cytosine.
Based on this question, although the following four species are different: Human , Chimp, Gorilla, Orangutan, but their DNA contains the following same components; sugar deoxyribose and the base thymine. This is because all DNA has deoxyribose instead of ribose and thymine instead of uracil.
Plants use CO2 in the process of photosynthesis to make
Answer:
food for less than a year ago today was a good day for you drink a lot of water and summer vacation visiting with you drink a lot of water and summer vacation visiting with you and your name and address in a bit in me in me in me in
You wanted to prepare a fish dish for your grandfather that he loves the dried salted Codfish. But you noticed that this might be causing a
problem for your elder grandfather since he has hypertension, what would you do to remove the salt from the fish? (Answer with one word)
What is the mechanism by which the salt gets out from the fish? (one word)
* Please put a comma and space between the two answers word.
Answer:
1) pour boiling water
2) plasma
Explanation:
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The graph shows how the activity of an enzyme changes at different temperatures. Which
statement best describes what happens to the enzyme when the temperature of the reac-
tion increases to 45 degrees Celsius?
X = optimal temperature
Rate of reaction
20 30 40 50
Temperature / "C
А
The enzyme is used up and the reaction stops.
B
The enzyme begins to decrease the rate of the reaction.
С
The enzyme continues to increase the rate of the reaction.
D
The enzyme changes shape and can no longer speed up the reaction.
Answer: D
Explanation: The enzyme changes shape and can no longer speed up the reaction
-Just did this so it's right lol
Please select the word from the list that best fits the definition
A change in an organism’s surroundings that causes the organism to react.
Answer:
stimulus
Explanation:
i will give brainlyest if right
Answer:
d is the answer
You should be familiar with the drugstore antibiotic ointment Neosporin (Triple antibiotic ointment), which is often thought of as innocuous. Based on your knowledge of antibiotics from Chapter 12 describe the mode of actions of the three antibiotics found in Neosporin (neomycin, polymyxin, and bacitracin), research their side effects, and postulate on why these three antibiotics were chosen.
Answer: Antibiotics are chemicals which, in low concentrations, can selectively kill or inhibit the growth of most pathogenic bacteria and are not harmful to humans.
Explanation:
Neosporin is a type of antibiotics which is used for the treatment or prevention of mild superficial infections. It consists of three active component, hence the name Triple antibiotic ointment. These active components, their mode of action and side effects include:
--> NEOMYCIN : This is one of the active components of Neosporin which inhibits the protein synthesis of an invading pathogenic bacteria through irreversible binding to the 30 S ribosomal subunit of susceptible bacteria. Their MODE OF ACTION is bactericidal meaning that the effect it has on the protein synthesis inhibits it's growth leading to the death of the bacteria.
SIDE EFFECTS: it can cause irritation, burning, itching, rash redness when applied topically.
--> POLYMYXIN: This is one of the active components of neosporin which attacks the invading pathogenic gram negative bacteria. In its mode of action, is the ability to combine with and disorganise structures of the bacterial cell which are responsible for the maintenance of the osmotic equilibrium of the cell thereby exposing the underlying peptidoglycan layer to lysozyme.
SIDE EFFECTS: Burning, redness, or irritation of the skin may occur.
--> BACITRACIN: This is also one of the active components of Neosporin. In its mode of action, it inhibits bacterial cell wall synthesis. This is achieved by preventing the final dephosphorylation step in the phospholipid carrier cycle, which interferes with the mucopeptide transfer to the growing cell wall.
SIDE EFFECTS: it may cause rash, itching/swelling (especially of the face/tongue/throat).
These three active components of Neosporin are combined to broaden the antibacterial spectrum. This means that at least one of the active components will effectively kill an invading pathogenic bacteria through its unique mode of action.
which of the following does not take place in the mouth
Answer:
I. sorry but I didn't see options.
How does inhibiting calcium helps to terminate skeletal muscle contraction
Answer:
The inhibition helps terminate contraction because once the outflow stops, the active transport of calcium is able to slow down and the troponin can change back to its original shape.
Explanation:
2. What are some other traits that are inherited in a similar fashion to human height?
I
Answer:
Hair colour
how sensetive their skin is
allergies
hand size
Explanation:
Quantitative (polygenic) traits are inherited in a similar fashion to human height.
Quantitative traits, also known as 'complex' traits, are phenotypic features controlled by many genes that have minor effects.Quantitative complex traits are influenced by both genetic and environmental factors, as well as by the interaction between genetic and environmental factors.Some examples of quantitative human traits include height, weight, predisposition to cardiovascular diseases, etc.In conclusion, QUANTITATIVE TRAITS are inherited in a similar fashion to human height.
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4. Convert this DNA sequence, ATTAG, to mRNA.
Answer:
UAAUC
Explanation:
in RNA, T => U
A gardener wanted to know if E-Z fertiliser would be good for his vegetables. He fertilised all his bean plants with E-Z fertiliser but didn’t put any fertiliser on his pepper plants. His beans didn’t do well at all, but he got a good crop of peppers. He concluded that E-Z fertiliser was no good. What are the errors in this experiment? Tick all that apply
A) Not enough subjects
B) Subjects were not similar
C) Conditions were not kept the same
D) The experiment was not reproduced
Answer:
B) Subjects were not similar
The errors in this experiment are: subjects were not similar and conditions were not kept the same. Hence the correct options are B and C.
Subjects were not similar: The gardener used two different types of plants, beans, and peppers, to test the effectiveness of E-Z fertiliser. Beans and peppers have different growth requirements, nutritional needs, and environmental preferences. By using different types of plants as subjects, the experiment introduces variability and makes it difficult to attribute the outcome solely to the fertiliser.
Conditions were not kept the same: The gardener applied E-Z fertiliser to the bean plants but did not provide any fertiliser to the pepper plants. This difference in treatment introduces a significant confounding factor, making it impossible to isolate the effect of the fertiliser on the bean plants' poor performance.
Hence the correct options are B and C.
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An animal has 2 genes: 1 for tail length (T) and 1 for head shape (H). Its genotype is TtHh. What are all of the possible gametes that this organism can make?
Answer:
TH, Th, tH, th
Explanation:
This question involves two genes; one coding for tail length and the other for head shape. According to this question, an organism has the genotype: TtHh.
In accordance to the law of independent assortment, which states that alleles of one gene will segregate independently of one another. The meiotic division of the organism, will occur in such a way that only one allele of each gene is present in any GAMETE.
The possible gametes for the genotype: TtHh are: TH, Th, tH, th
The esophagus is surrounded by smooth muscle. How does this structure help its function?
Answer:
the smooth muscle contracts a certain way so it works without you thinking about it
Explanation:
I hope this helped!!
PLS ANSWER ASAP PLSSSSSSSSSSSSSSSSSSSSSSSSSSSS
Place the following events in the order they occur by listing their assigned letters in that order. A. Cas9 REC domains binds to the guideRNA B. Cas9 complex binds to dsDNA C. Cas9 complex scans dsDNA for PAM sequence D. Cas9 unwinds dsDNA E. The programmable part of the guideRNA binds to its complementary sequence F. Cas9 cuts both strands to generate a double strand break
Answer: a, b, d, c, e, f
Explanation: The steps of Cas9 DNA recognition and cleavage goes in the following order lettered A, B, D, C, E and F. Cas9 recognizes and binds the sgRNA after which it binds to the double stranded DNA. It then unwinds and scans the dsDNA for its protospacer adjacent motif sequence (PAM) and on recognition the sgRNA binds to its complementary sequence followed by cleavage of the DNA at two points. That is how the double stranded break is created.
An organism has the following characteristics: cell wall, heterotrophic, unicellular, and prokaryote. What kingdom does it
belong in?
0 Animalia
O Protista
Plantae
O Eubacteria
Answer:
2nd
Explanation:
Can similar mineral composition be found in rocks both the Rocky Mountains and the Great Plains even though the rocks look so different
a short paragraph explaining how natural selection occurred using the pocket mouse.
natural selection explain the change with time of darker mice into lighter mice? Because predators could more easily spot the dark mice on light sand. The lighter mice were more likely to survive and have offspring. Over time, the population became light colored.