system
A chat on 4chan
human
Adam was the first biologist because he observed and named God's creatures, most texts use the term for animals, but presumably he gave the first names for plants and other organisms as well. He wasn't necessarily capable of agriculture though, that role was more for Cain and Abel who represented the first planter and butcher respectively. 

Many theories point to the fact that Adam rejected God's creatures as being suitable wives for him, leading to Eve's creation. Some say the implication is that Adam rejected humanoid animals that in theory could be bred with, even if the result would occupy a liminal space between man and beast in true Mythical form like the Minotaur or a variety of figures in Hellenic narratives. Others would bring in stuff like Lemuria, Atlantis, and so on and so forth. There are a lot of variants of those kinds of myths considering how much they're saturated in neo-religions. 

If we're trying to stick to relatively traditional Abrahamic worldviews, God made all creatures and without the taint of the inherent disorder created by Adam's failure to lead Eve and obey God, all Creation is good. What makes Adam distinct is being in God's image and being given the privilege of dominion over Earth with the duty of responsible stewardship. The Fall merely ensured that human rule over the Earth would become difficult and confused. Man wanted to be like God, so now Mankind must act out a microcosm of what God did to the Abyss, replenishing and subduing Chaos. 

I suppose that'd include humanoids, whatever forms they may take. I have a lot of theories about demons, angels, the Fae, and otherworldly beings in general. It's a fascinating topic. Admittedly I have a long ways to go in terms of understanding things.
gpt
Thanks for the insightful response, English isn't my first language so I find it hard to communicate the ideas I have, but would you say Adam is the ancestor of humanity? You said that Adam was the first 'biologist' who named everything, which means since he was created in the image of God and ate from the Tree of knowledge, has intellect and ethics, which are qualities the caveman is incapable of.
Thus the question, do we all share a common ancestor? What's up with the difference in blood rhesus? Are the descendants of Adam in any way better than those of the caveman (mainly spiritually...)?