How many major mass extinction events have taken place in the Phanerozoic eon?
A) three
B) six
C) five
D) one
Correct Answer:
Verified
Q42: During respiration glucose combines with _ to
Q43: Molecules of _ are thought to have
Q44: What type of microbes would you expect
Q45: Humans are
A)photoautotrophs.
B)photoheterotrophs.
C)chemoauthotrophs.
D)chemoheterotrophs.
Q46: Given the surface waters on Mars were
Q48: The second major rise in oxygen in
Q49: The first hominids appeared _ years ago.
A)50
Q50: During metabolism water combines with _ to
Q51: Scientists believe that early Earth's atmosphere was
Q52: Which chemical compound makes up 50 percent
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