What is the best description for a Mutagen? A. Inherited factors that cause a mutation. B. Any mutation to DNA. C. Environmental factors that cause a mutation. D. Something that already has a mutation.

option B is correct

The best description for a Mutagen is  Any mutation to DNA because “Mutagen is a physical, chemical or biological agent that causes mutation by altering the genetic material which possibly results in the disease condition.

Explanation:

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it is called the mitotic spindle