Question

why variations are necessary for the survival of species ? explain

Answer 1

Variation allows the species to survive despite the changing weather/climate/season - whereas there are kinds of the species that like the hot weather, and other like the cold weather. 

Answer 2

Variations are beneficial to the species than individual because sometimes for a species, the environmental conditions change so drastically that their survival becomes difficult. For example, if the temperature of water increases suddenly, then most of the bacteria living in that water would die. Only few variants that are resistant to heat would be able to survive. However, if these variants were not there, then the entire species of bacteria would have been destroyed. Thus, these variants help in the survival of the species. However, all variations are not necessarily beneficial for the individual organisms.

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