Why is variation beneficial to the species but not necessarily for the individual?

When all members of a species are slightly different, there's a better chance that at least some will survive if the environment changes. But for one particular organism, being different might not help it at all — it might even be a disadvantage.

Variations are differences in traits among individuals of the same species arising from genetic recombination and mutations. They are beneficial to the species because: 1. Survival under changing conditions — If the environment changes (e.g., temperature rise, new diseases), some variants may have traits that help them survive and reproduce. The population as a whole adapts through natural selection. 2. Evolution — Variations provide the raw material for evolution. Over generations, favourable variations accumulate, leading to new species. For an individual, a variation may not be useful: 1. A variation might be neutral or even harmful in the current environment. 2. The individual may not live long enough to benefit from its variation. 3. Reproductive success matters more for species-level survival than individual fitness. Therefore, variation is a population-level advantage, not always an individual advantage.