她决定在大学里学习生物科学。

She decided to study the ___biological sciences at university.

保罗一直都知道沃森夫妇不是他的亲生父母。

Paul always knew that the Watsons weren't his ___biological parents.

污染会对生态系统产生严重的生物学影响。

Pollution can have serious ___biological effects on an ecosystem.