और

The latest research shows that the evolution of man has been accelerated in the past 5000 years as compared to the time of Neanderthal man (30,0000 years back). The factors for that are:
1. Large population size2.Immense geographical spread3.mixing of genepools.
I was happy to know this but there is a question??????????????the acceleration of evolution must have had a force behind it। FORCE.......may be physical। Help me out to find this force.