A) 3.5 million years
B) 35 billion years
C) 35 million years
D) 3.5 billion years
Correct Answer: D
Solution :
The history of life on Earth began about 3.8 billion years ago, initially with single-celled prokaryotic cells, such as bacteria. Multicellular life evolved over a billion years later and it's only in the last 570 million years that the kind of life forms we are familiar with began to evolve. Our own species, Homo sapiens, evolved only 200,000 years ago.
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