申論題

一、配合題。請就下列 68 個選項中，選擇最合適的答案，將答案號碼填入各題中。 ※請於答案卷上自行複製以下的作答格式，並請以「數字代碼」作答。

20. Combining the monozygotic and adoption study methods, researchers often study monozygotic twins raised in different families. Using this method, similarities in behaviors, traits, and psychological disorders between monozygotic twins raised apart helps researchers determine the effects of __________ .