Why did animal life probably diversify during the "Cambrian explosion"?

a. predator-prey relationships stimulated animal diversity
b. changing sea levels increased available land for animal habitat
c. increases in atmospheric oxygen allowed larger body sizes
d. the permian extinction left many vacant niches
e. A and C


Answer: e. A and C

Biology & Microbiology

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Nutrient absorption is mediated by the

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In an atom, the number of protons always equals the number of

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