Approximately how far back in time does the fossil record extend?

a) 3,500,000,000 years
b) 5,000,000,000,000 years
c) 6,000,000 years
d) 3,500,000 years
e) 6,000 years


Answer: a) 3,500,000,000 years

Biology & Microbiology

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The animal in the above photograph was

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