What makes a human? The step before a human already had all those things.
We generally distinguish
modern humans (Homo sapiens) from the earlier species of genus
Homo. However, since Neanderthals
(Homo neanderthalensis) had a highly-developed culture and (apparently) lived in peace with the
sapiens who migrated into Europe, as the ice age ended (and as we now know the two species even interbred, leaving lots of Neanderthal DNA in several European populations)... many scientists prefer to put the Neanderthals on the same plateau as our species.
But if you're looking for the point in time, at which animals that we refer to as pre-modern humans first appeared on this planet, then you're looking at
Ardipithecus. Ardi is the first Great Ape species that wandered off into a new evolutionary line, which continued to veer further and further off from all the other species of Great Ape (the 2 species of gorilla, the 2 species of chimpanzee and the 2 species of orangutan). Ardi had several anatomical features that placed her (the first specimen found was female) clearly on a new evolutionary path.
She had only one prehensile toe on her feet (the hallux or "big toe"), which allowed her to use her feet to escape from predators, but otherwise the foot was built for both climbing and bipedal walking.
So the answer to your question, "What makes a human," can be:
- 1. Ardipithecus (which goes back about 7 million years) and all of the intermediate species between Ardi and our own species
- 2. Or the two most recent species of genus Homo: neanderthalensis and sapiens.
- 3. Or JUST Homo sapiens, the only member of the genus still in existence.