Question

variation is used for survival of species over long time but the variants have unequal chance chance of survival explain this is statement

Answer 1

Variations are beneficial to species than individual because sometimes the environmental conditions  for a species change so drastically that the whole population can get wiped out. For.eg. population of bacteria living in ocean.If suddenly temperature of water rises, the variants which are heat resistant will survive and the other variants would die. thus these small heat resistant variants would survive and the species would not be extinct.

thus, variation is used for survival of species over long time but the variants have unequal chance of survival.

Answer 2

Variations happen due to inaccuracies in DNA copying.Thus new organisms with variations may have survival advantages and can adapt to the environment.as new generations come there is more accumulation of variations which help in survival of such species.Such species have better chances of survival For example,in a bacteria population,new variants are formed.if the temperature of water in which they live is increased,the bacteria tolerant to heat that is the variants will survive while the normal bacteria dies...