How does the creation of variations in a species promote survival?
Variation is the only factor of evolution. Evolution is the gradual changes in some features or functions of the pre-existing species. Every individual organism varies in their size, shape, behaviour from other organisms. Variations in the environment ensure survival because when any organism adapts themselves according to the variations there will be long term survival for that species, those species will survive who will struggle for their existence. The organisms who live in unfavourable conditions have to do more efforts for survival and those who survive in the most drastic conditions will be the fittest survival organism also known as Natural selection theory.
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