Answer:
The new examinations of bones and stones which are nearly two million years old forced many scientists to abandon a cornerstone view about the human traditional theory. The difficult situations are trying to work with less number in examples of fossils, and trying to work with the modern populations of humans. Genetics shows us that this is further confused by some back-crossing of the Neanderthal and Denisovan branches in some geographical human populations. However, current work on the genetic investigation in present-day human populations shows some genes from a diversity of old ancestors.