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Q.

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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a

zero

b

10

c

15

d

05

answer is B.

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Detailed Solution

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Population growth = (Natality + Immigration) – (Mortality + Emigration)

                                              = (250+20) – (240+30) 

                                              = 270 – 270 = 0

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