🧬ap biology review

Mass Extinction

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

A mass extinction refers to a significant and widespread decrease in the diversity and abundance of life on Earth, resulting in the extinction of numerous species within a relatively short period of time.

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