When was the height of the african slave trade 1660-1810 1660-1910 1560-1710 1760-1810

There are traits like blood type and eye color, and others like speaking english or having a scar. what are the terms used to describe these different types of traits? how are each defined?

What refers to the existence of more than one level of government in the country

What role did natural resources play in african politics?