The second major rise in oxygen in Earth's atmosphere around 580 Ma was caused by
A) the radiation of multicellular photosynthetic organisms.
B) the erosion of red beds.
C) global volcanic activity.
D) something that scientists are still uncertain about.
Correct Answer:
Verified
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
Q47: How many major mass extinction events have
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
Q53: Of the following,humans are most related to
A)cyano-bacteria.
B)methano-bacterium.
C)slime
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