Which of the following statements best describes the effect of mass extinctions and the radiation of new bio-logical diversity?

a. Mass extinctions have no effect on radiations.
b. Mass extinctions prevent potential radiations by eradicating the necessary biological variabil-ity.
c. Mass extinctions provide opportunities for radiations by survivors as dominant groups die out.
d. The overall effect of mass extinctions on radiations depends on the time scale under considera-tion.


D

Biology & Microbiology

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