A. 100 million
B. 4 million
C. 3 million
D. 50 million
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The correct answer to the question: "Cambrian explosion occurred years ago___________?" is "100 million".
A. 100 million
B. 4 million
C. 3 million
D. 50 million
The correct answer to the question: "Cambrian explosion occurred years ago___________?" is "100 million".
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