Human beings (homo sapiens) evolved during which geologic era?
A) the Cenozoic
B) the Mesozoic
C) the Paleozoic
D) the Precambrian
Correct Answer:
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Q20: How long did the Proterozoic eon last?
A)approximately
Q21: The stratigraphic order of the fossils from
Q22: Which of the following statements regarding radiometric
Q23: Which of the following statements about radioactivity
Q24: A rock formed with 1000 atoms of
Q26: Which of the following materials might be
Q27: Almost nine-tenths of Earth's history occurs during
Q28: Which of the following radioactive isotopes is
Q29: The absolute age of a geologic event
Q30: Which of the following instruments is used
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