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Q.

First cellular forms of life appeared

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a

4 bya

b

4 mya

c

2 mya

d

2 bya

answer is B.

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Detailed Solution

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The first cells are heterotrophs which were formed about 2000 million years ago. The mechanism of how non-cellular aggregates of giant macromolecules could evolve into cells with membranous envelop is not known.

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