[SunStar]

Even a fertilized egg can survive outside the womb, with assistance, for a time.

Yes, but not all the way to personhood.

[chimera]

But the poster imposed no such condition, only survivability outside the womb. Even a "clump of cells" can do that, for a time. My point is that if you're going to make ex-vitro survivability your ethical lodestar of personhood, you'd better join the pro-life movement, because you've moved the timeline back to the point of conception (whether you realize it or not). Otherwise, you're going to have to walk the logical plank of defining (and defending) another arbitrary point in time, i.e., how long is long enough in terms of survival ex-vitro and why? That's hopeless, because we can logically argument that point into non-existence.