Basically add up all the sides... And that's the perimeter don't forget to add your units
Among all the countries that you mentioned, Gabon is the country that receives the most rainfall.
Adjacent to the Atlantic Ocean.
Answer: Disease (economic disruptions) Also keep in mind that bacterica, cancer, tumors etc. were not brought up till the 1980's - 2000's
Explanation: Look at my comment because it got cencored for some reason