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A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is:

1. 15
2. 05
3. Zero
4. 10

Correct answer: 05

Solution

Net population change equals natality plus immigration minus mortality minus emigration. Here, 250 + 20 - 240 - 30 = 5, so the population increases by 5.

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