animal extinct some why adapt to global warming 一般过去时 that, whether, as, as if, as though, because引导的表语从句 关系副词why引导限制性定语从句

happiness 一般现在时 关系副词why引导限制性定语从句

preserve that, whether, as, as if, as though, because引导的表语从句 关系副词why引导限制性定语从句