Good job. Did you know that H. antecessor was a cannibal species of early human that consumed other humans due to the smell that the DNA of the different species of humans secreted? Did you know that Early humans smelled differently, DNA wise, which is attributed to the region on Earth where there were from. Humans in an arid region would smell differently then a human in a colder region. The reason for the difference in the DNA smell that secreted was because of the way each human species adapted to their environment. One species would smell different because they produced hair to keep warm in the colder regions while the smell of a human species from a warmer region was different because the human didn’t produce as much hair to keep warm.
Early humans hunted using an increased sense of smell. The brain recognized almost instantly that a human was nearby. If that smell didn’t match the DNA smell of the tribe, the other human was usually looked at as being food even though the two humans might look nearly the same.
What is concerning, to me at least, is the DNA trait that early humans used to hunt other humans with. If a virus was ever able to select the most fit human as a host and activated such a trait the infected human would first kill or at least try and kill those around her or him that smelled differently. If the infected person bit another person and the second person lived, the virus could be passed on to the new human causing the same trait to emerge. Essentially a zombie/cannibal virus. A virus that would cause two different DNA smelling humans to attack each other to pass the virus on. But once infected both hosts would secrete the smell of the virus so as to better recognize them from other humans.
Just a theory though. Let’s hope it never happens.