(B) $Mutation$ is defined as a sudden heritable change in the $DNA$ sequence of an organism. These changes introduce new alleles into the gene pool,wh

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(B) $Mutation$ is defined as a sudden heritable change in the $DNA$ sequence of an organism. These changes introduce new alleles into the gene pool,which leads to genetic diversity. Therefore,$Mutation$ is a primary source of variations in organisms,which provides the raw material for evolution and natural selection.