At the same time, however, the canine teeth had ceased to project above the level of the other members of the tooth row the way they do in virtually all nonhuman relatives.This may indicate that the canine teeth were no longer being used for defensive or aggressive purposes and that they were being replaced in this capacity by handheld implements made of perishable materials.The soft tissues of the body do not generally survive the process of decomposition.
In general, those who have trouble learning the rudiments of language will have less chance for survival.
The cultural ecological niche puts a premium on those portions of the brain associated with linguistic capability.
At the time when Darwin was writing, there was only the most rudimentary sort of a fossil record to support his view, and he was further hindered by the use of the term man to stand for the human species as a whole.
As that word suggests, there was a tendency to conceive of males as typifying the human condition.
That body of verbally transmitted learning and traditions is referred to as culture.