factor of the habitat

例句：

1. 1. The bird'shabitat is threatened by deforestation.
   鸟类的栖息地因森林砍伐而受到威胁。
2. 2. The scientist studied the effects ofpollution on the marine ecosystem.
   科学家研究了污染对海洋生态系统的影响。
3. 3. Thelocal government has been workingto preserve the natural habitat ofendangered species.
   当地政府一直在努力保护濒危物种的自然栖息地。