问题详情

Why does the professor mention the wood thrush？

A．To contrast its displacement activities with those of other animal species

B．To explain that some animals display displacement activities other than grooming

C．To point out how displacement activities are influenced by the environment

D．To give an example of an animal that does not display displacement activities

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！