Carbon isotope evidence from rocks found in Greenland, although controversial, suggests that life may have
A) existed before about 3.0 billion years ago and may well have existed before 3.5 billion years ago
B) originated about 3.0 billion years ago
C) existed 3.85 billion years ago
D) originated when the Earth formed 4.6 billion years ago
Correct Answer:
Verified
Q9: Stromatolites date back to approximately
A) 4.6 billion
Q11: Why have studies of the geological record
Q16: Carbon-13, with an atomic number of 6
Q18: Recent evidence that supports the controversial claim
Q19: Recent evidence that supports the controversial claim
Q21: According to modern biological evidence, modern DNA-based
Q22: One type of early pre-cell (vesicle) probably
Q24: What was NOT an important source of
Q25: One factor that hampers the use Miller-Urey
Q39: Life probably did not originate on the
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