Scientists believe that early Earth's atmosphere was devoid of oxygen because of the existence of ________ at that time.
A) volcanic eruptions
B) plate tectonics
C) oceans
D) amino acids
Correct Answer:
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A)50
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A)cyano-bacteria.
B)methano-bacterium.
C)slime
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Q56: Organisms can reduce global warming by
A)producing carbon
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