The appearance of multicellular organisms coincided with increased levels of _______ in Earth's atmosphere.
A) sulfur
B) hydrogen
C) nitrogen
D) carbon
E) oxygen
Correct Answer:
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Q54: The possible collision of a large meteorite
Q55: Refer to the graph showing variations in
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Q57: Refer to the figure. Q58: At the end of the _ period, Q60: Which statement about the mass extinction at Q61: Which of the following represents a correct Q62: Which geological period is the most ancient? Q63: The Cenozoic era began about _ years Q64: During which of the following geological periods
A)
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