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

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answer is 2.

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Detailed Solution

Population growth = (Natality + Immigration) – (Mortality + Emigration) = (250+20) – (240+30) = 270 – 270 = 0

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