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 (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 30.
The net increase in population is
(a) 05 (b) zero
(c) 10 (d) 15.
by

1 Answer

Answer :

(b) zero
by

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