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One likely reason that only microbes existed for the first two billion years of life is a)...

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Biology

One likely reason that only microbes existed for the first twobillion years of life is

a) high concentrations of ozone in the stratosphere.

b) the absence of nitrogen in the environment at the time.

c) the toxicity of oxygen to multicellular organisms.

d) high levels of iron oxide in the water.

e) low concentrations of O2 at that time.

Answer & Explanation Solved by verified expert
4.4 Ratings (833 Votes)
Ans Around 35 billion years back microbial mats represented the first form of life on earthThese were multilayered films of prokaryotesmainly consisting of bacteria along with some archaeThey mostly    See Answer
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