Population Ecology

AP Biology· difficulty 3/5

The age structure shown has a constricted base relative to middle-aged classes.

What demographic trend does this pyramid most likely indicate?

  • A

    Population is shrinking due to low birth rates

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  • B

    All cohorts have equal mortality

  • C

    Birth rates exceed death rates

  • D

    Population is growing rapidly

Explanation

A narrow base with larger middle-aged cohorts indicates declining birth rates and predicts a shrinking population over time.

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