Combining Twin and Adoption Studies,researchers Often Study Monozygotic Twins Raised

Combining twin and adoption studies,researchers often study monozygotic twins raised in different families.Using this method,what do similarities in behaviours,traits,and psychological disorders between monozygotic twins raised apart help researchers to determine?

A) whether it is detrimental to separate twins at birth
B) the effects of genes on psychological functioning
C) whether genes or adoption impact psychological functioning
D) the effects of adoption on a child's psychological functioning

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