A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigra- tion 20 and emigration 30. The net in- crease in population isA. 5B. zeroC. 10D. 15

A biologist studied the population of rats in a barn. He found that th

1.	A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigra- tion 20 and emigration 30. The net in- crease in population isA. 5B. zeroC. 10D. 15
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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, immigra- tion 20 and emigration 30. The net in- crease in population isA. 5B. zeroC. 10D. 15

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