He is wrong because "Specialization can occur from biological forces as well."
Explanation:
The biological forces are the non-social factors which enhances the physical structure of a person, mostly it is about the human physic. Biological forces also affects the person's psychological as well as the sociocultural forces in order make a fully organized and developed human being or a person. Not only the physic it may be any physiological, chemical, neurological or can be genetic condition. They are the primary factor to know the behavior of a person.
