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Question

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

A
2 billion years ago
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B
3.5 billion years ago
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C
1 billion years ago
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D
3 billion years ago
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Solution

The correct option is D 3 billion years ago

The universe is about 20 billion years old and the first non-cellular form of life originated about 3 billion years ago. Photosynthetic bacteria appeared 3.3-3.5 billion years ago.

So, the correct answer is "3 billion years ago".


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