56. Pelycosaurs are: A. Extinct B. Living Fossil C. Question undefined D. None of the above
Option A.Pelycosaur is an older term for basal or primitive Late Paleozoic synapsids, excluding the therapsids and their descendants. Previously, the term mammal-like reptile had been used, and pelycosaur was considered an order, but this was discovered to be incorrect and is now seen as outdated.
