it is possible that是什么从句

Question

这是什么从句?that it is possible..修饰的哪一部分
Former US President Bill Clinton stepped into the debate urging Scots to vote No.He said:"Unity with maximum self-determination sends a powerful message to a world torn by identity conflicts that it is possible to respect our differences while living and working together."

Answer 1

that it is possible to respect our differences while living and working together 是名词性从句中的同位语从句，它解释前面的名词identity conflicts。it 是形式主语，它代替后面的动词不定式短语to respect our differences。

Answer 2

就是定语从句啊.that it is possible是用来补充说明那个message的内容的.

Answer 3

这是一个格形式主语从句，真正的主语在后面。举例说明：It is possible that you can make the world more beautiful！真正的主语就是that之后你可以使世界变得更美好。