DNA doesn't prove what a species is. It's how humans identify what a species is. DNA provides only the chemical information. Those chemicals still have to be synthesized and assembled through gestration. I don't see how you can conclude that an embryo is a human being on the sole basis that it can't be anything else. Where is the logic in that? Since when do we classify something on the basis of what it COULD be? You say it's undeniable. I say it's an assumption without sufficient logic. I admit I could be wrong, but are you willing to admit the same?