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Which of the following might a scientist cite as a reason for the Cambrian explosion?
A. Lower oxygen levels in the oceans.
B. Heightened diversity of fossils.
C. Heightened availability of minerals in the oceans.
D. Lowered predation leading to better survival of species.
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Which of the following might a scientist cite as a reason for the Cambrian explosion?
A. Lower oxy...
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