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Q.

When did the first non-cellular form of life originate on the earth?

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a

About 3 billion years ago

b

About 2 billion years ago

c

About 20 billion years ago

d

About 4.5 billion years ago

answer is A.

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Detailed Solution

About 4.5 billion years ago, the earth was formed.
About 3 billion years ago, the first non-cellular form of life came into existence. They would have been giant molecules like RNA, protein, or polysaccharides.
About 2 billion years ago, the first cellular form of life originated.
About 20 billion years ago, the universe was formed according to the big-bang theory.

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