A phylogenetic tree includes which clade is the outgroup and

A phylogenetic tree includes, which clade is the outgroup and why

Porifera

Choanoflagellates

Arthropoda

Nematoda

Annelida

Mollusca

Rotifera

Platyhelminthes

Chordata

Cnidaria

Solution

Choanoflagellates is the outgroup. Choanoflagellates serve as a reference group when determining the evolutionary relationship among all other mentioned groups of organisms.It is from the choanoflagellates that all other groups evolved.