how does the creation of variation in a speech ensure survival ?
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The creation if variation takes place due to the changes in the copying of DNA.Due to the changes in the DNA structure the body functions of the progeny also changes in comparision to its parents.So suppose that the parents are not able to live in a particular niche but the progeny may survive in that niche due the variations adopted during fertilisation of gamets.Thus these variations help in the survival of species.
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Explanation:
All the variations in the species do not have equal chances of survival in the environment. The survival of the variations depends upon the nature of variation. Different individuals have different chances. Selection of variants by environmental factors forms the basis for evolutionary processes. These variations may lead to increased survival advantages of the individuals due to positive adoption of traits or may merely contribute to the genetic drift.
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