Simplify the following text for a Grade 8 native English-speaking person.
Original: However , other taxonomists argue that there is a valid place for groups that are paraphyletic , contain their most recent common ancestor but does not all the descendants of that ancestor .
Simplified: However , many other taxonomists would argue that there is a valid place for groups that are paraphyletic , i.e. contains its most recent common ancestor but does not contain all the descendants of that ancestor .