1.the number of snow leopards has fallen ______human activity destroying much of their habitat.
2.the number of this kind of fish are decreasing mainly _____the pollution in the river.
选词填空！谢谢！

due to引导表语 because of 引导状语 第一个空填because of 第二个空填 due to 但我觉得填什么都对，好像没什么影响吧

due to 固定搭配，“因为，由于”跟because 意思差不多，后面接从句…而because of 后面接的是名词代词或短语类的，像“because of you ”这样的，后面不可接从句。