Question

Variation is useful for the survival of species over long time. But the variants have unequal chances of survival.explain.

Answer 1

1. Variation acts as a source of raw material for evolution of species.

2. Variation leads to genetic diversity, which is a key for the evolution of species. Animals are able to adapt themselves to the changing environment by inheriting some of the beneficial variations. Organisms are better suited to face the struggle for existence due to the presence of variations.

3. Variations give the species an individuality of their own. In the absence of variation, there would be no science of heredity as all individuals of a race, would be identical to one another in all aspects.

All the variants, however, do not have equal chances of survival. Depending on the environmental conditions, the nature favours only those variations that are able to adjust to the changing environment. The theory of natural selection favours the survival of the fittest. 

Answer 2

variations are helpfull for the species but not equal for varients because the variation are the changes shown by offspring and changes can be in favour or opposite for organism