Question

Why is variation beneficial to the species but not necessarily
for the individual ?
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Answer 1

Answer:

The variation is important and beneficial for species as it allows a species to adapt to a changing environment. ... Only those who adopt the changes can survive in harsher conditions by adapting to the changes. For an individual, the variation doesn't matter in most of the conditions.

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Answer 2

Answer:

Organisms are normally adapted to live in a particular kind of niche. In case of alteration in the ecological condition of that niche, the organism would not be able to survive. Only the variants of the organisms resistant to changes would survive and grow further. Thus, variation is beneficial but not necessarily for the individual.