A biologist studied the population of rats in a barn. He found that the average natality…

Biology · NEET · NTA ExamsOrganisms and Populations

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:
  1. 15
  2. 05
  3. zero
  4. 10

Answer

(C) zero

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