A)distinct front (head)and back (tail)ends. B)specialized sensory organs clustered at the front, or head, end. C)specialized appendages along both sides for locomotion. D)specializations for rapid locomotion in all directions. E)complex behavior.
If continuing analyses confirm that ctenophores are the sister group to sponges plus eumetazoans, which of the following conclusions would be supported?
A)Nervous systems evolved convergently in ctenophores and eumetazoans. B)Flow-through guts evolved convergently in eumetazoans. C)Nematocysts evolved convergently in ctenophores and eumetazoans. D)Sexual reproduction evolved convergently in ctenophores and eumetazoans.