Question

Which of the following are ancestors of mammal
A sauropsids
B thecodonts
C synapsids
D terapsids

Answer 1

Answer:

thecodants

Explanation:

will be the right answer to your questions

Answer 2

Explanation:

Synapsids[a] – not to be confused with therapsids,[b] which are a subordinate group to synapsids – are a group of animals that includes mammals and every animal more closely related to mammals than to the other members, reptiles and birds, included in the amniotes clade.[2] They are easily separated from other amniotes by having a temporal fenestra, an opening low in the skull roof behind each eye, leaving a bony arch beneath each; this accounts for their name.[3] Primitive synapsids are usually called pelycosaurs or pelycosaur-grade synapsids. This informal term consists of all synapsids which are not therapsids, a monophyletic more advanced mammal-like group. The non-mammalian synapsids are described as mammal-like reptiles in classical systematics;[4][5] they can also be called stem mammals or proto-mammals.[6] Synapsids evolved from basal amniotes and are one of the two major groups of the later amniotes, the other being the sauropsids, a group that includes modern reptiles and birds. The distinctive temporal fenestra developed in the ancestral synapsid about 312 million years ago, during the Late Carboniferous period.