[Solved] Reason Twins Often Share

Suppose someone argued that the reason twins often share multiple sclerosis is not because it’s hereditary, but because of some abnormality in the mother’s pregnancy, such as maternal exposure to a toxin or virus. What argument could you give against this hypothesis?

Please discuss.

1. Your original post must have a clear understanding of the topic and should be a minimum of 1 paragraph with at least 5 sentences