A significant reduction in the amount of which gas would allow more ultraviolet radiation to reach the earth's surface?
A) carbon dioxide
B) methane
C) ozone
D) cyanide
E) oxygen
Correct Answer:
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Q1: The first cells were most likely heterotrophic
Q31: The theory that eukaryotic organelles originated as
Q32: The first enzymes were probably:
A) protein reproducing
Q33: The results of the experiment represented in
Q34: The first cells were probably:
A) autotrophic aerobes.
B)
Q35: The earliest photosynthetic autotrophs were probably:
A) similar
Q38: Organisms whose metabolic processes are harmed by
Q39: Cyanobacteria can be found in columns of
Q40: Protobionts produced by abiotically produced polypeptides are
Q41: One source of fossil organisms in Precambrian
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