Embryo: In humans, the developing organism from the time of fertilization until the end of the eighth week of gestation, when it is called a fetus (emphasis my own).
But even granting that the human embryo is an organism, and that we can know precisely when this new organism comes into existence, many will still deny -- based on I cannot understand what logic -- that the embryo is a person.
With my same colleagues at the ethics committee, in discussion about the status of the human embryo, I recall opening my comments by reading the first pages of Embryo: A Defense of Human Life by Robert George and Christopher Tollefesen. There, the authors relate the story about the recovery of 1,400 embryos during Hurricane Katrina, including the embryo that was Noah Benton Markham who was born 16 months later. The excerpt stated that if the officers had not recovered the canisters of liquid nitrogen, "the toll of Katrina would have been 1,400 human beings higher...and Noah, sadly, would have perished before having the opportunity to meet his loving parents." I then asked my colleagues if any of them would disagree with the affirmation that Noah Benton Markham was rescued from the hospital in September 2006. Not to my surprise, one of my colleagues (whose own son happens to be named Noah), with candid intellectual honesty replied that, yes, in fact he would disagree with that statement. He held, rather, that Noah came into existence some time after that embryo was rescued.
When pressed, many thoughtful Americans would say the same.
I respectfully submit that they assume this to be the case -- that we come into the world as embryos, but "become" persons at some later state of gestation -- oblivious to the problematic upshots of such a contention: the anthropological dualism it entails [My thinking self is some other thing than the organism I use which came into existence at conception] and the arbitrariness it lays itself open to [So, we "become" persons at what stage? At 14 days? At 21 days? 22 days? And why not 23 days or after 7 weeks of gestation?].
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As I explained elsewhere last month, there is a logic of biological facts which underlies the mystery of our coming into existence. That logic can enable anyone to see that if today I am an individual human organism of the species homo sapiens, endowed with tremendous potentials and certain inalienable rights, this also had to be the case of the embryo I once was.
We can only become what we already are.
Rhesus monkey embryos don't become gold fish.
Human embryos don't become salamanders.