Human being is a biological term, we're not talking about biology.
Yes we are, hence why we don’t refer to species other than HUMAN BEINGS as persons.
As I already pointed out, when we talk about what makes someone a person we're talking about things like the ability to feel, think, self awareness, etc. What qualifies as the criteria is whatever we value, making the term inherently subjective.
No, because as I already pointed out then that would make other species that possess those traits persons, they’re not because of one simple fact, they’re not HUMAN. Want to know what makes someone a person? Well it’s a lot simpler then you may think, it’s simply being them which is what? HUMAN, it isn’t subjective by any measure, humanity is the common denominator here, you can’t shy away from it no matter how hard you try. Honestly I can’t believe a subject like this is even entertained in the first place, it seems like it should be common knowledge that all humans are persons and all persons are humans, that correlation isn’t subjective in the slightest sense.