Well my thought would be because way back when our language was being formed we viewed ourselves, and still do, as to be superior to other beings. its more a matter of perspective than actually being. from our perspective we are the superior species due to our understanding and cognitive abilities, thus making us worthy of "being" human. that being said, the merriam webster dictionary's definition of being is : 1 a: the quality or state of having existence b (1): something conceivable as existing (2): something that actually exists (3): the totality of existing things c: conscious existence : life.
so anything that exists in this world that is living or conscious is a being of some sort. so the reason we call ourselves human beings would be because it sounds good and through the years it has been ingrained into our minds as a speech default. if we called ourselves human objects from the beginning we would probably have a discussion on why do we call ourselves human objects and not dog objects or cat objects. so it wouldent really be a biological question, more of a linguistic question.
i hope that made sense and i dident make a fool of myself on my first post.
