When exploring the respective influences of heredity and environment in contributing to mood disorders, many researchers compare the instances of the disorders among the biological and adoptive families of people who have bipolar disorder. What do these comparisons show

These comparisons show: that the influence of heredity are stronger that those of environment.

Explanation:

This study of bipolar disorders has shown how heredity is a big factor that influence or that contribute to this disorders. Environment has not that much influence in comparison to the biological facts found in the history of the biological families.