Which three factors have the greatest effect on earth's climate?

The three factors are the sun, the atmosphere, and the ocean. The sun puts thermal energy (sunlight) into the atmosphere. It is also carried into the oceans. The water will heat and evaporate, putting more salt into the atmosphere and making the air dense. The heating of the ocean also can create waves which can change the climate.

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.

Well, a and b together would be negative. b alone would also be negative.