The simplest life forms appeared on Earth when it was how old?
A) five million years
B) one billion years
C) 2.5 billion years
D) 3.5 billion years
E) 4.5 billion years
Correct Answer:
Verified
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A)living cells.
B)carbon-based.
C)silicon-based.
D)found only on Earth.
E)not
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