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vlabodo [156]
3 years ago
5

Which process is most responsible for the increase in early Earth's atmospheric oxygen levels?

Biology
1 answer:
Alik [6]3 years ago
8 0
Which process is the most responsible for the increase in early Earth's atmospheric oxygen levels?

Photosynthesis

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Are human cells more similar to plant cells or bacterial cells?
luda_lava [24]

more similar to bacterial cells

8 0
3 years ago
In an analysis of the nucleotide composition of DNA, which of the following proportions will be found?
katrin [286]

Answer:

With respect to the composition of DNA, in an analysis it can be found that the proportions of nucleotides are A + C = G + T (option a).

Explanation:

The proportion of nucleotides in a DNA molecule can be established according to the sequence of these nucleotides on both complementary strands, since the purinic bases of one strand are complemented by the pyrimidinic bases of another:

  • <em>Adenine is complemented with Thymine A=T</em>
  • <em>Guanine is complemented with Cytosine G=C</em>

From this we can deduce that in a DNA molecule with two chains there will be the same amount of adenine and thymine, as well as the same number of guanine with respect to cytosine, so:

<em>     A + C = G + T</em>

An example of this would be a known DNA molecule (hypothetical), with 5 molecules of Adenine and 7 molecules of Guanine. In this case there are 5 Thymines, complementary with Adenine, and 7 Cytosines like Guanine:

<em>     A + C = G + T</em>

<em>     5 + 7 = 7 + 5</em>

6 0
3 years ago
Atoms react with each other due to the need for
IrinaK [193]
Stability.
Atoms react with other atoms to be stable.
3 0
3 years ago
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Think about water and how it rolls up in the beach think of all its qualites is it alive according to the characteristics of lif
gogolik [260]

Answer:

No, I don't reckon that water is alive. I don't think that it is "dead" either. It simply just... exists. However, it DOES hold life within it. But the water itself is not alive, because for something to be considered "alive", it must meet the requirements of responding to stimuli, reproducing and growing, and must be dependent on its environment. Water itself cannot be dependent on an environment, because it IS an environment.

This is just my opinion though :)

4 0
2 years ago
In one or two sentences, explain how cats and dogs, both mammals, could be classified as distinct animals. What characteristics
IgorC [24]

Answer:

Cats and dogs are both mammals because they have hair, are warm-blooded, and nourish their young with milk. Dogs and cats are distinct species, incapable of producing offspring together because of the many differences in their genome.

Explanation:

i hope this was helpful!

8 0
3 years ago
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