What type of power generation can cause air pollution?

wind
coal
geothermal
solar

What are the answers for the following questions?

Select the best hypothesis explaining why countries may have preferred communism. communism promised jobs after the insecurities of war. communists forced the people to do what they said. communism was fueled by a dislike for democracy. communism provided economic freedom for businesses and workers.

Which of the following graphs represents exponential decay