Which of the following is essential for speciation?

  • A
    Seasonal isolation
  • B
    Reproductive isolation
  • C
    Behavioral isolation
  • D
    Mechanical isolation

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When two related populations occupy geographically or spatially separate areas,they are called

$XX$ is a type of selection process in evolution. $XX$ promotes population changes in one particular direction. $XX$ favours small or large-sized individuals,and the mean size of the population changes in $XX$. Identify $XX$.

The two key concepts of Darwinian theory of evolution are:

'$A$ brief reduction in size of a population,due to natural calamities,usually leads to random genetic drift'. For this statement,identify the correct example from the following.

The idea of natural selection as the fundamental process of evolutionary changes was reached:

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