In nature,the occurrence of mutations is:

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(D) Mutations are sudden,heritable changes in the $DNA$ sequence. In nature,most mutations are either neutral (having no effect on fitness) or harmful

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Mostly neutral or harmful

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(D) Mutations are sudden,heritable changes in the $DNA$ sequence. In nature,most mutations are either neutral (having no effect on fitness) or harmful (deleterious) to the organism. Beneficial mutations are extremely rare. Therefore,the occurrence of mutations is mostly neutral or harmful.

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