polyphyletic origin

Are Humans Polyphyletic? According to the tree of life, members of a common ancestral group that stop interbreeding form separate stems or sister taxons. For example, chimpanzees and human beings are sister taxa. There are three main designations of phyletic, or race and tribe, groupings: monophyletic, paraphyletic, and polyphyletic. Are humans a paraphyletic group? A