add to意思

But a group is no organism physically added to its constituent individuals; it has no brain or stomach of its own; it must think or feel with the brains or nerves of its members.但，群体除去是由单个的人组成外，并非真的具备生理用途的有机体，它没我们的大脑和肠胃；它需要依赖其成员的大脑和神经，进行考虑与感知

看了翻译对于这个词汇和句子还是没法非常不错把握，请问这里的add to到底的意思是呢

过去分词短语 physically added to its constituent individuals，作 organism 的定语。等于which is physically added to its constituent individuals。

But a group is no organism physically added to its constituent individuals.
【直译】但，一个群体并非（在生理上附加到其组成个体上的）有机体。

划线部分是定语，即：汉语括号内的部分。