So now you are adding it needs DNA that is specific only to humans, and also be a self sufficient organism?

What about individuals cells then? Most could be self-sufficient in an environment with proper water and nutrition. A sperm cell can survive for up to 4 days in the proper culture. An ova can do the same, but longer. That satisfies both your conditions. Is that then a human?

Define sentience then.

Is it the use of tools? The awareness of time, and planning ahead? Manipulating one's environment to better its chances at survival? Or as you put it, feeling emotion, being self-aware, "consciousness"?

Animals have demonstrated all of these.

And your argument is ill-defined. What are you saying is consciousness? Most people define it as an "alert cognitive state" which most animals are.

Well, of course I agree that a chimpanzee is not a human, and a part of a human is not a human.

My argument was rather with your statement that "all it takes to be human is human DNA" as both my examples had human DNA, and therefore according to your logic, would both be human.

According to your argument, a chimpanzee is then 98% human. The difference in relative "humanity" between a homo sapien and a Starfish is a a paltry 40% or so. Both chimanzees and starfish are definitely not Human, so your argument logically falls apart.

Also, extending your argument that "all you need to have to be human is human DNA" a vat grown organ, kept alive by machines and actual human interaction, would be human according to your example. Again, we can definitively state that a vat grown human is not actually a human.