Then remove it and let it live.
Really? Surely you see what a silly "determiner" you've just set up...but I'll play along...
See, I completely agree. This is why I don't understand why people get so mad when I tell people I'm planning to leave my toddler alone for the two weeks my husband and I go on vacation. If the little urchin is human - he'll survive just fine for two weeks without me. And if he doesn't...well, then he wasn't human and my husband and I did nothing wrong...
Or...See, I completely agree. My best friend was in the hospital a few years ago for Toxic Shock Syndrome. When her organs starting shutting down they put her in a medically induced coma to try to stop the damage and I was all like, "No way...turn those machines off. If she can't make it on her own...then she isn't really a human...and I'm not about to be best friends with a non-human!"
Just because a human needs support to live doesn't mean they aren't human. And implying that because a fetus isn't capable of living outside the womb is a dangerous determiner for pro-life supporters to go by since the time when a baby can survive with medical intervention outside the mother's body is getting pushed up all the time...its currently around 22 weeks.
To say that something isn't human until 22 weeks...unless a brave doctor can somehow save a kid born at 21 weeks...then its human at 21 weeks...isn't really the argument that I would go with...especially since you're NEVER really going to be able to come to a firm determiner of where life begins that everyone will agree on anyway.