Mammals Belong to a Synapsid Clade Called ______________

Question

Mammals belong to a synapsid clade called ______________.  
A) placoderms
B) ostracoderms
C) cloacae
D) therapsids
E) placentals

Accepted Answer

Mammals evolved from a group of synapsids called therapsids. Placoderms and ostracoderms are both extinct groups of armored fish, and cloacae refers to a common opening for the digestive, urinary, and reproductive systems found in some animals. Placentals are a subclade of mammals, not the entire group.