Question

In a clade, mammalian has the three descendents: monotreme, marsupials, and eutheria. What will these three descendants together be called?

Answer 1

These three descendants together would be called sister groups.

Hope this helped :)

Answer 2

Sister groups.

Step-by-step explanation:

A sister groups or taxon is a phylogenetic term that shows relatives that are close of a given subunit in evolution. It indicates where two descendants split from.a node.

Marsupial is the sister group to subclass eutheria i.e placenta mammals and form the clade Theria. The Theria is a sister clade to monotremes which form mammals.