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The term natural selection was given by sir.Charles Darwin.....according to it nature selects the organism to sustain in the following environment..variation in genes also plays a vital role in natural selection as well as in evolution...

VARIATION->NATURAL SELECTION->EVOLUTION

for ego's herbivorous animals had short neck and some with long neck (due to Variation ) the grass fields vanished due to over grazing by herbivorous animals but leaves on trees remained..Then every herbivorous animal tried to eat the leaves but they failed and died because they couldn't reach the leaves as it was in greater heights but the animals with longer neck ate the leaves and sustained..

the above example shows the function of natural selection..The animals which were capable to eat leaves of trees the survived while the animals with shorter neck were eliminated by nature

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