When do we become people?

When did I become me? I suppose I would have been conceived in January, at which point I would have been a mere single-celled, fertilized zygote. That zygote met pretty much all of the properties of life biologists typically use to distinguish what is alive and what is non-living: It was organized by molecules and organelles, had a metabolism, could maintain homeostasis and was growing. It is at this point that 95% of biologists would consider me “alive.” Some cultures protect this zygote’s life, with countries like Honduras, Montenegro, and the Philippines banning even the morning-after pill.