题目内容

On the other hand, traits that are not liable to be influenced by the environment are more likely to ____(显示) a high degree of similarity in identical twins.

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Helen was confident, ____(有风度的), made the most of her personal appearance, and showed considerable polish and ease in social relationships.

____(遗传) or environment: which is stronger?

The relative effects of heredity and environment are most clearly observable in ____(同样的) twins.

The following case ____(说明) what happens to identical twins when they are brought up in contrasting environments.