Carbohydrates require a prolonged process of digestion in order to be broken down into glucose and maintain proper blood sugar levels.
a. complex
b. simple

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

not sure if this is what you'r looking for eubacteria and archaebacteria