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A biologist studied the population of ra...

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 increases in population is

A

5

B

zero

C

10

D

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, immigration 20 and emigration 30. The net increase in populations is :

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