Question

Why is variation beneficial to the species but not necessarily for the individuals???? please anyone ans dese!!!!!!!!!

Answer 1

Variation is important for the survival of species as it makes species more adapted to survive with the changing conditions.Variation mainly makes differences at the species level at each generation but ageing.If an individual naturally accumulates variation in his gene 
,composition through  mutation or any other source could be harmful.Thus variation at individual level isn't so useful at individual level as a person does not evolve by variation.

Answer 2

Heya mate
The answer of ur question is

♢ 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.

hope it helps