Answer:
primative stage is called stone age . it is oldest stage.people run here and there for food.
modern age is called age of civilization.it is present age.people live permanently in this stage.
Explanation:
hope it helps you.
Aids, because Africa does not have the medicine that's for a lot of diseases. Unlike the counties that's above the equator l.
I believe it was John Brown
In 1834, Cyrus McCormick invented and patented the mechanical reaper, to make harvesting grain easier.