The oxidizing atmosphere probably developed approximately _____ billion years ago.
A) 1.5
B) 2.0
C) 3.5
D) 4.5
Correct Answer:
Verified
Q8: If the hypothesis that protocells were based
Q11: The Greek terms for "small" and "ball"
Q18: It is likely that the protocell was
A)heterotrophic.
B)chemoautotrophic.
C)photoautotrophic.
D)All
Q24: With the appearance of photosynthetic cyanobacteria and
Q24: Mass extinctions
A)have occurred at least 5 times
Q26: The dilemma of whether proteins or nucleic
Q27: The Earth's primitive atmosphere was produced primarily
Q33: Fossils from the Paleozoic are plentiful because
A)mammals
Q39: The time that it takes for half
Q41: Plate tectonics explain that the amount of
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