The presence of cyanobacteria ____ in rock dating to 2.5 billion years ago is direct evidence of the first water-splitting photosynthesizers.
A) microfossils
B) biosignatures
C) stromatolites
D) cytoskeletons
E) endosymbiont
Correct Answer:
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Q3: Ribozymes may have originally developed by _.
A)
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Q16: Some scientists believe that RNA was the
Q17: "Prebiotic soup" refers to _.
A) the interior
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Q32: According to the endosymbiont hypothesis, _.
A) most
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