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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 population is :
Options
(a) 15
(b) 5
(c) zero
(d) 10
Correct Answer:
zero
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
