I believe so
What is it that shows that a person exists? If those things are not noticed, yet can you be certain that the person does not exist, where he is certainly growing?
The matter, the substance of a person shows that one exists, and can quite objectively seen - for example, I exist because I'm here. However, it is the understanding that one exists - the "knowing" that one exists - as the determination of personhood. If I do not know I exist, if I cannot feel, or love or hate or experience life, then I am no longer a person. Perhaps, I would be technically, biologically alive, but I would no longer be a person.
No mystery in what I'm saying. It's in the Bible. It's also outside the realm of known, natural sciences. It is not ours to draw lines, where we run out of drawing materials.
I'm still unclear as to what you mean here. Perhaps you could give me an expansion of this thought?
What if you were assigned a blastocyst, but "its" life was terminated?
I don't think people are "assigned"
Does that which a scientist does not know by the scientific method not exist?
A rationalist scientist would probably say no, but I would disagree