AP Environmental Science : Population Ecology

Study concepts, example questions & explanations for AP Environmental Science

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Example Questions

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Example Question #161 : Ecosystems And Biology

A town of 20,000 people experienced a birth rate of 25 per 1,000 per year and a death rate of 7 per 1,000. There were 600 immigrants into the town and 200 people emigrated from the town. Using these values, calculate the population size for the following year.

Possible Answers:

Correct answer:

Explanation:

To calculate the city population for the following year, we take the initial population (20,000 people), add the annual rate of natural population change, add the number of immigrants and subtract the number of emigrants.

Now, we need to multiply this percentage of of population change by the original population size (20,000 people).

The population will naturally grow by 360 individuals. Now, add these individuals, subtract emigrants, and add immigrants to to the starting population size in order to calculate the new population for the next year.

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