Jerry, the operative term here is "random underlined passages in my books." You seem to have attempted to understand none of this, not even mentioning that it is an obvious application of the Aristotelian notions of horismos and entelecheia as applied to a temporal phenomenon (human beings) within a basically Lutheran understanding of human nature. Heidegger is not talking about biology at all, he is attempting to describe the structure of the temporally determined locus of understanding and relate it to its borders, in terms of which it understands itself and the world, that is, its birth and death. You probably don't understand what that means, but that have less to do with the words or content but with you possibly just not being very smart.
Frankly you're coming aross as a real twit, lazy and "willfully ignorant." Actually a bit of a pseudo-intellectual.
That said, I'm not going to engage with you the subject, cause you don't know what the fuck you're talking about.
Nu, zayats, pogodi!
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