The reason often given for the low regard in which smell is held is that, in comparison with its importance among animals, the human ...?

The reason often given for the low regard in which smell is held is that, in comparison with its importance among animals, the human sense if smell is feeble and undeveloped.

這句話的given是pp嗎?
in which的用法是因為後面的held嗎?
that後面的句子是在說明that嗎?
更新: TOMING88 謝謝大大的回答,但是given為什麼用PP?
PP不是要有BE動詞嗎?
我是不知道為什麼要用in which而不是in
2 個解答 2