A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigra

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. `05`
B. zero
C. `10`
D. `15`

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

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