There is evidence that life existed about:
A) 3.5 billion years ago.
B) 2 billion years ago.
C) 1.3 billion years ago.
D) 630 million years ago.
E) 250 million years ago.
Correct Answer:
Verified
Q10: Presently, it is thought that organic polymers
Q11: The approximate age of the Earth is:
A)
Q12: The hypothesis that organic molecules formed near
Q13: The Earth's early atmosphere was probably strongly:
A)
Q14: A compound that could not have been
Q16: Amino acids and other organic molecules were
Q17: The hypothesis that life developed from nonliving
Q18: The atmosphere of the early Earth is
Q19: Some protobionts have been shown to have
Q20: Assemblages of abiotically produced polymers are called:
A)
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