This is a very interesting question and it
depends largely on definitions. Even the word
hominid has varying meanings depending on who you
ask varying from strictly meaning the ancestors of
humans over the last 4 million years to
encompassing all of the great apes (humans,
chimpanzees, gorillas, and orangutans).
As you get evolutionarily closer to modern
humans where we diverge from the rest of the great
apes, there is still some controversy over who
we're descended from. Much of this difficulty
arises from the fact that we have only a limited
number of bones from these ancestors and
frequently, each one seems to indicate some new
branch of our genetic tree. There may yet be other
bones out there waiting to be discovered and tell
more of the story.
A very good website for further explanation of
human evolution is the Smithsonian. It poses what
we know with pictures of the fossil remains and it
also tells about some of the controversies.
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