First you have to ask yourself what it means to be human. I wasn't aware we defined them by how many limbs you have or lose.
I suppose in taxonomy you define them by their features, which are just products of their genes. Nonetheless, unless we alter the genome, won't we always be human? regardless of the other physical modifications. I mean we all still call Stephen Hawking human, and he isn't exactly a paragon of our race (physically).
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