[NateEag]

You, too, can be considered a bundle of cells.

A bigger bundle, but still a bundle.

Sure, you don't need a womb to survive, but you still need a pretty specialized environment. See all the concerns about global warming - mangle our environment just a relatively little bit and we're toast.

You're both humans with your own unique DNA. One of you is a lot younger than the other.

I wouldn't kill a thirty-year-old because they're doomed to get cancer, nor a one-year-old, nor a negative-six-month-old.