Clades can be very large, like the clade that includes all animals, called metazoa.

进可以非常大，比如包含所有动的进，称为后动。

And what they were trying to figure out is where metazoans fit and who is related to whom.

而他们试图弄楚的是，多细胞动在进树中的位置，以及哪之间有亲缘关系。

Although they seem to be of little relevance, they're good candidates for studying the evolution of metazoans because they represent the most ancestral state of the group.

虽然它们看起来没什么关系，但它们是研究后动进的好候选人，因为它们代表了个群体最古老的状态。