Why is it that the people of africa are so varied and different?

Which is likely the most serious problem associated with an epidemic? 1. there are sometimes no cures to the diseases that spread. 2. people often die from the diseases that spread. 3. there are usually no ways to prevent people from getting ill. 4. people often don’t know they have a disease.

How did europeans and africans displace native americans in north america’s predominant peoples?

What are some of the difficulties that the japanese face due to the islands' geography?