What Factors Might Affect How Similar Or Different A Pair Of Identical Monozygotic Twins Are?

What Factors Might Affect How Similar Or Different A Pair Of Identical Monozygotic Twins Are? What factors might affect how similar or different a pair of identical monozygotic twins are? Such factors could include environmental influences, such as exposure to infection or diet, as well as other effects, such as somatic mutation, effects of aging,