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

进化枝可以非常大，比如包含所有的进化枝，这称为。

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.

虽然它们看起没什么关系，但它们是研究进化的好候选人，因为它们代表了这个群体最古老的状态。

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

而他们试图弄清楚的是，多细胞在进化树的位置，以及哪些之间有亲缘关系。