Which of the following gases was not present in the Earth's early atmosphere but appeared after the evolution of certain organisms?
A) hydrogen
B) methane
C) nitrogen
D) oxygen
E) carbon dioxide
Correct Answer:
Verified
Q4: Which of the following is not one
Q5: Multicellular eukaryotes arose about:
A) 3.8 billion years
Q6: The most significant outcome of the Miller
Q7: Chemical evolution:
A) cannot be investigated experimentally.
B) was
Q8: One critical requirement for life to arise
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
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