The first cells appeared on Earth about __________ years after its crust solidified.
A) 1 billion
B) 200 million
C) 3.8 billion
D) 4.5 billion
E) a few
Correct Answer:
Verified
Q5: Life probably would never have emerged on
Q5: The "big bang" refers to
A) an
Q7: DNA replaced RNA as the main information
Q11: Aerobic respiration became established as a result
Q14: Proto-cells are considered to have
A) been simple
Q16: Many organic compounds essential for life do
Q17: Simulation experiments like those first performed by
Q18: After the discovery of T.aquaticus, biologists found
Q23: By 3.2 billion years ago, chemosynthetic cells
Q24: Hydrothermal vents are associated with the newest
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