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. 15B. `05`C. zeroD. 10

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, immigration 20 and emigration 30. The net increase in populations is :A. 15B. `05`C. zeroD. 10
Answer» Correct Answer - C Net increase in population : (Natality + Immigration) - (Mortality + Emigration) (250 + 20) - (240 + 30) 270 - 270 = 0

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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. 15B. `05`C. zeroD. 10

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