Extinction

AP Biology· difficulty 1/5

K-Pg event Time Mammal diversity

Mammalian diversity dropped at the K-Pg boundary but then rapidly increased afterward. Which best explains this rebound?

  • A

    Sympatric speciation alone created the increase

  • B

    Adaptive radiation into niches vacated by non-avian dinosaurs

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  • C

    All extant mammals derived from a single founder

  • D

    Hardy-Weinberg equilibrium maintained mammal diversity

Explanation

The K-Pg extinction eliminated non-avian dinosaurs and freed many ecological niches. Mammals diversified rapidly to occupy them, an example of post-extinction adaptive radiation.

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