The earth is believed to be 4,500 million years old, life on this planet

The earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than

(a) 4,200 million years ago
(b) 3,500 million years ago
(c) 1,600 million years ago
(d) 459 million years ago

3,500 million years ago

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