$A$ 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
    $5$
  • B
    zero
  • C
    $10$
  • D
    $15$

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The basic unit of animal population which is communal interbreeding,in a species is known as

The aggregate of processes that determine the size and composition of any population is called:

Density of population increases when . . . . . . .

Describe the various processes responsible for fluctuations in population density.

Which one of the following is $NOT$ a characteristic of a population?

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