Microfossil evidence suggests that life
A) originated when the Earth formed 4.6 billion years ago
B) originated about 3.0 billion years ago
C) existed 3.85 billion years ago
D) existed before about 3.0 billion years ago and may well have existed before 3.5 billion years ago
Correct Answer:
Verified
Q8: Which approach is currently proving to be
Q8: The most common isotope of carbon is
A)
Q9: Why is the claim of the discovery
Q9: Stromatolites date back to approximately
A) 4.6 billion
Q10: The layered colonies of microbes found in
Q11: Why have studies of the geological record
Q13: The most conclusive evidence for microfossils comes
Q14: Current geological evidence suggests that life
A) must
Q16: Carbon-13, with an atomic number of 6
Q19: Where in the "Tree of Life" will
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