I think it came from the Muslim scientist if I remember right from what I just learned
I believe the answer is: brain changes that greatly improve dexterity
As we are conditioning ourselves to do something with a certain part of our body, our brain would eventually improve and adjust itself to make us able to do that thing better, even on automatic function. The same thing happen to soccer youths who are continuously trained to use both of their leg to make a maneuver ever since they're little.
A during the two centuries following the discovery of the new world, over 90% of the native population were killed by disease and warfare
Answer:
To avoid conflict in the society
To live peacefully
