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
Correct answer: B. zero
- A. 05
- B. zero
- C. 10
- D. 15
Explanation
Natality and immigration positively contribute to the population growth while mortality and emigration are negative factors. In the given question, The net increase in population is natality + immigration = 250 + 20 = 270 The net decrease in population is mortality + emigration = 240 + 30 = 270 Thus, net increase in population = 270 - 270 = 0
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