With the appearance of photosynthetic cyanobacteria and aerobic bacteria during the Precambrian era,
A) an oxidizing atmosphere developed on Earth.
B) the formation of the ozone shield occurred.
C) the amount of UV light reaching the Earth was reduced and chemical evolution slowed.
D) All of the choices are correct.
Correct Answer:
Verified
Q19: It is likely that the protocell was
A)heterotrophic.
B)chemoautotrophic.
C)photoautotrophic.
D)a
Q20: Which piece of evidence would best support
Q21: All of the following statements concerning the
Q22: Three fossils are found in undisturbed layers
Q23: Which hypothesis states that the synthesis of
Q25: The formation of simple organic monomers,such as
Q26: Which event and date is mismatched?
A)origin of
Q27: The scientific study of fossils and what
Q28: Miller and Urey's experiment provided support for
Q29: Fossils used to define and identify geologic
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