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Agata [3.3K]
3 years ago
15

Which type of fossil gives us the most direct evidence of life that lived long 1 point ago?

Biology
1 answer:
lbvjy [14]3 years ago
4 0
more evidence please
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Carbon atoms in organic molecules most commonly
Makovka662 [10]
Found in every single organic molecule.
6 0
3 years ago
What additional information would assist you in determining whether polar bears and grizzlies are different species, based on th
ladessa [460]

Answer:

The correct answer is- e. I and II only

Explanation:

According to the biological species concept, a species is the population of organism in which the individual are able to interbreed with each other and also able to produce viable and fertile offspring.

Therefore here to determine whether polar bears and grizzlies are different species we have to get information that whether the F1 generation of grizzlies and polar bears is viable and able to produce their own offspring that means are F1 generation fertile. So the correct answer is e. I and II only.

5 0
4 years ago
Mutagens are useful in biotechnology research for producing organisms with altered phenotypes. producing new organisms which hav
ICE Princess25 [194]

Answer:

The correct answer is A.

Explanation:

A mutagen changes the level of mutations that occur in the DNA either by affecting it physically or chemically. This helps researchers create different organisms with altered phenotypes according to what the research needs so that the genes can be investigated further under a controlled environment.

So the answer is A.

I hope this helps.

4 0
4 years ago
photosynthesis and cellular respiration both use electron transport chains. what is the source of electrons for photosynthesis a
goldfiish [28.3K]

Water serves as an electron source in the electron transport process of photosynthesis. The electron is extracted from water by using solar energy.

What is the electron transport chain's source of energy?

The electron transport chain uses the energy released by oxygen and reduced compound reactions such as cytochrome c and (indirectly) NADH and FADH2 to pump protons into the intermembranous space, producing the electrochemical gradient over the inner mitochondrial membrane.

In photosynthesis, water is split to produce electrons in the presence of sunlight, a process known as the photolysis of water. The electrons are finally transferred to NADP+ by the chloroplast electron transport chain, where they are reduced to NADPH.

Therefore, In aerobic respiration, electrons from NADH and FADH2 are transferred to oxygen by the mitochondrial electron transport chain to reduce oxygen in the water.

Learn more about photosynthesis from the given link.

brainly.com/question/1388366

#SPJ4

6 0
1 year ago
Approximately, how many national parks are there in the United States?
TiliK225 [7]

Answer:

50

Explanation:

There are actually 58, but the closest approximation here is 50

6 0
3 years ago
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