AP Environmental Science Quiz
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POPULATIONS
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An age-structure diagram shows a wide base, but the 15–19 cohort is unusually large compared with both 10–14 and 20–24. Which is the best explanation?
A
A temporary spike in births about 15–19 years ago
B
A sudden increase in death rates among 15–19-year-olds
C
A long‑term decline in fertility over many decades
D
An increase in life expectancy among infants
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