[IB Biology Ecology Reviews]


11. Consider 5 human populations that differ demographically only in their age structures. The population that will grow the most in the next 30 years is the one with the greatest fraction of people in which age group? Explain your answer.

a. 10-20

b. 20-30

c. 30-40

d. 40-50

e. 50-60

The best answer is a. Individuals aged 10-20 years old will be able to reproduce by age 12-13 in many cases and are able to reproduce until age 45-50 (females). Thus the country with the higher percentage of its population in this age group will increase its population fastest.

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