it is reported that part of the animals can not stay alive i

It is reported that（a） part of the animals can not stay alive in water at 1500 meters below sea level.
空应加在part前面,表示数量,修饰part.
in water是泛指,不必加冠词
意思为“据报道,有一本分动物在海平面以下1500米无法生存”
希望能帮到你