It is circular. "The cell is a human because the cell is a human organism".
As in, given the right conditions it will continue to divide.
A sperm requires an egg to become a zygote.
A white blood cell may eat an organism if it's phagocytic - but it will never grow to be a fully developed human.
Faeces is just....well....that.
I don't really know where we can say during development: that is a human....and before that it wasn't. Is a 38 week foetus a human? Does it become one at birth?
I'm just trying my best to classify it according to the limited knowledge I have regarding embryological development.
The entire discussion is about what is morally significant. The confusing part is to try to introduce a term that has no inherent moral significance and lean on that in a conversation about morality. What I've been trying to get you to do is to articulate, without resorting to convention or definition, WHY this matters. What is the moral significance? You have spent a lot of time and effort to claim that there is something fundamental that happens at fertilization. Most of that argument seems to be that the fundamental thing that happens at fertilization is that a term that you like is defined there. I'd like to understand what it is that is significant about this, and why this is meaningful to a discussion about morality.
From what I've researched, it seems we stop developing embryos at 14 days because of a compromise that looked at the legal and moral rights of the embryo, rather than addressing when life actually begins.
Say we remove all limits on embryo development and decades/centuries from now we have complete ectogenesis. Do we then have to go back to the question of when life begins, or revert back to the 14 day limit when deciding what can be allowed with an embryo being gestated ex-utero.
Morality is based on cognition. That's why we pull the plug and incarcerate. It's why we chop down trees and experiment on mice. I think from a moral perspective, there is no reason to treat embryos or fetuses as entities that have rights.
Cognitive capability. It is why you get to vote when you're 18 and drink when you're 21. Your brain has finally developed into the last of your rights.
Makes sense, but how do you test that in the real world. Should we treat the severely debilitated stroke patient as having the same rights as a tree? Do they have more or less than an embryo/foetus?
Let's acknowledge that the answer can't be farther back than 14 days, which is where we are now (though Texas is almost at the same point currently INSIDE THE WOMB, because 14 days of embryonic development is nearly 6 weeks of "pregnancy"). I think the answer is probably that 21 weeks is still too early. But it would require a new legal theory, which is not particularly "pragmatic". Since we're talking about genetic engineering, it is possible that we develop a human-like creature that is much farther along in brain development by 21 weeks. And so if it's to be a thorough new theory, it needs to rest on precisely the cognitive capabilities that we actually care about protecting rather than a line in the sand along gestation time.
Anyway, the practical answer today, not in this hypothetical, is that we protect premature births as any other born baby.
Again, you can see how complicated this would be to implement, and what a moral mess it could become.
What happens if/when there is an overlap between the extremely premature human and the organism that's been allowed to develop purely in vitro....
I didn't understand what you meant, and inferred you were talking about the rights of a pregnant person.
Were you talking about the rights of the human being gestated through artificial means?