Answer :
Final answer:
Primates with tails form a paraphyletic group because not all descendants (like apes) have tails. The absence of a tail is a synapomorphy for apes, distinguishing them from other primates. An ancestral trait shared by apes and their ancestors is the flexible shoulder joints that allow for brachiation.
Explanation:
The group of primates with tails is considered paraphyletic. A paraphyletic group includes an ancestor but not all of its descendants. In this context, some primates, such as apes, have evolutionary ancestors with tails but do not have tails themselves.
A synapomorphy for apes, or a characteristic that evolved in the ancestor of a group and is shared exclusively by members of that group, is the absence of a tail. This trait differentiates apes from other primates.
An ancestral trait for apes would be a trait shared with their common ancestors. One key ancestral trait is the highly flexible shoulder joints that allow for brachiation.”
Learn more about Primate Evolution here:
https://brainly.com/question/32155
#SPJ1
