That was a wonderful read. It's refreshing to run into an intelligent debate here. I agree we are both coming from a scientific perspective.
The fact that it survives separate from the mother but dependent on her furthers this in the same way that Siamese twins are separate people but have identical DNA.
Except Siamese twins are not separate people. They literally are not separable. They are conjoined people. Interesting term, don't you think? Not-separate plural people. Why is that? Because nearly every human culture values the mind above all else. If a person had one head but multiple pairs of legs, we'd say it was one person. Two heads means two people because the mind is what we value. As do zombies. It's why this society has no problems slaughtering animals for food.
Nevertheless, this gets into rather murky ethical territory that most people on this forum can't even begin to comprehend, but I'm reluctantly willing to discuss with you despite onlookers: why do we value babies or fetuses who do not yet possess such consciousness? Forget law, let's stick to ethics. I'll come back to science shortly.
I'll remove us from the topic slightly with a thought experiment. Say there are two dogs of the same age and breed facing certain doom, and only one could be saved. Now one of the dogs belongs to a family that loves it, and the other is a stray. Even though neither dog possesses consciousness, the decision of which to save is blatantly clear. That reasoning, combined with the potential for consciousness, is why we protect babies in this society. More notable is the fact that such potential for consciousness is held valuable to vastly different degrees for each person, which is ultimately the underlying issue being debated in every abortion discussion.
OK so let's return to the science:
To understand this line of logic better, what would you consider a bacteria that lives within a human hosts’ stomach? That is clearly not ‘part’ of the host. It is a parasite (and I must point out that no matter how much emotion that word might bring into this debate - parasite is the most accurate way to describe a fetus). That parasite is unique in its existence. It is clearly a singular organism that is not a human. Its designation as a bacterium of a specific kind is found in its DNA, its individual status is found in the fact that it operates individually.
A fetus fits all the same criteria that a bacterium does. Why then are we so hesitant to ascribe it the same exact status as that bacterium.
Excellent point, but I would disagree by bringing up symbiosis here. Bacteria serve purpose in our intestines. We can survive without them, but we do better with them. If we want to see the ultimate one-cell organism symbiosis, we need but look at our own cells. Mitochondria, the cellular organelle that provides energy found in every cell, has completely different, non-human DNA. It divides separately of the greater cell in which it resides, and is in every way a ghost of what was once a completely separate organism. But now it's not separate. It cannot be removed without both counterparts dying.
So let's return to gut bacteria. Are they separate or separable? Yes, they can be removed without dying. Do they serve a purpose to the host? The good kind, sure. Are Siamese twins separate or separable? Is a fetus? If the answer is no, it does not fit the same criteria as the bacteria. Does it more closely approximate mitochondria?
Lastly, I acknowledge that it is one more step in the developmental process. What I reject is that concept that developmental process starts with something other than a unique individual human. I am somewhat confused as to how you can state that it starts any other way. We do not start as a rock, lizard or another mammal. We start as a human, progress through the various developmental stages as a human and then die as a human. At no point along that entire chain are you not human nor at any point in time are you not a unique individual.
I disagree here, mostly because I don't see human cells and human beings as the same. Cancer creates unique human cells, but clearly cancer is not a human being. Nor does the uniqueness of the DNA actually matter, as we would both admit normal twins as two separate individual human beings. But one cell, while human, is neither a person, nor unique. It has the potential to become unique, but as I mentioned, potential is what the debate is all about. At the one-cell stage, it expresses the exact same proteins and markers as every other human embryo. There is literally nothing actively unique about it.
I see your stance on the matter, but I believe here is where we disagree. I see the human being part as something that is developed over time, without clear biologic borders.
So in summary: one cell not unique, uniqueness actually irrelevant, fetus not
separate individual, embryos human genetically but not yet human beings.