When the ____ came to a close, dinosaurs became extinct.
A) Holocene Epoch
B) Cenozoic Era
C) Mesozoic Era
D) Precambrian
E) Paleozoic Era
Correct Answer:
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Q21: The relative-dating principle of _ states that
Q22: Our ability to assign an age to
Q23: The Earth's largest mass extinction coincides with
Q24: The _ of a radioactive material is
Q25: The _ is based upon the observation
Q27: Isotopic dating has shown that the Precambrian
Q28: In geology, _ usually means determining time
Q29: The _ ended with the greatest mass
Q30: The _ is the principle says that
Q31: When marine geologists collects a core of
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