How does the creation of variations in a species promote survival? EXP

1.	How does the creation of variations in a species promote survival? EXPLAIN IN SHORT.
Answer» Some of the variations may be helpful to the organisms in the prevailing natural conditions. Organisms with such positive variations would survive. Over the period variations keep appearing in a species. The favorable variations are chosen by natural selection and promotes survival of the species.Depending on the nature of variations different individuals would have different kinds of advantage e.g., Bacteria variants which can tolerate heat have better survival chances in heat wave in comparison to non-variant bacteria having no capacity to tolerate heat wave.However not all variations are useful or beneficial.

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