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How does natural selection, operates acc...

How does natural selection, operates according to Darwin's theory of natural selection?

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Natural selection operates in the following ways according to Darwin.s theory.
(1) All plants and animals reproduce in geometrical pattern. The number of organisms produced are much more that can survive due to limited space and food.
(2) Due to same basic requirement competition between organisms take place and those who are better adapted to environment survive while the rest die.
(3) The individuals having useful variation overpower those without or having harmless variations and these variations are transmitted to future generations.
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