Natural selection can be defined as the process of selection of organisms that are better adapted to their environments. It refers to the changing and adaptation in the organisms.
- Natural selection is based on the concept of 'survival of the fittest'.
- The organism that is best adapted to its environment will be 'selected' by nature to survive and thus, pass forward its genes to the future generation.
- The scenario when there is no genetic variation present there will be no natural selection as there will be no 'fittest' organism.
- Moreover, the absence of reproductive barriers is bound to allow gene flow between two populations.
- Natural selection occurs when the conditions are not ideal and genetic variations are present.
Thus, it will occur in a geographical area with limited food. Hence, the correct answer is option C.
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