What are two sources of carbon dioxide in the air?

Carbon dioxide is the waste product of animal respiration, and is released by volcanos.

Answerair masses develop near the equator are warm; tropical air mass

Africans learned what the europeans wanted them to learn. instead of learning about african history and current information that could and would them they learned solely what europe wanted them to. and not everyone received the same education, some received better and others none.