When did biology's Big Bang (evolutionary explosion) occur?
A) approximately 65 million years ago
B) approximately 2.2 billion years ago
C) approximately 540 million years ago
D) approximately 3.5 billion years ago
Correct Answer:
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Q22: Elevation of the ground surface is measured
Q23: The three major global geosystems are
A)climate system,solar
Q24: What caused the mass extinctions 65 million
Q25: Earth's major layers include (from outermost to
Q26: Continental crust is _ oceanic crust.
A)less dense
Q28: The Mohorovičić discontinuity coincides with the _
Q29: Earth's atmosphere has been oxygen-rich for _
Q30: The first evidence of erosion by water
Q31: How old are the oldest rocks now
Q32: Stony meteorites are similar in composition to
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