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variations are useful for thr survival of species overtime but the variants have unequal chances of survival . explain this statement .

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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Mostly, variations are useful for survival of species, but it might also cause harm to them. For example, the horns of the stag, which are an variation, causes them to slow down due to its heavy weight, and can also get stuck in creepers and bushes, which makes them immobile and vulnerable to predators
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YES THE VARIATION MOSTLY OCCUR ARE MOSTLY USEFULL TO THE SPECIESBUT SOME ARE NOT FR EXAMPLE A GROUP OF BEETLE LIVING IN GRASS ARE IN GREEN BUT SUDDENLY VARIATION OCCURS RED BECAUSE OF WHICH SOME CROWS PICK THEM UP AND EAT THEN UP . THERE POPULATION GETS DECREASED .
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