Can some please help me with these 4 questions please I will give 30 points of answer is right and marked as brainliest also no links please

Which of the following terms describes the layers of air surrounding the earth ?

Why did the belgian parliament pass laws to decentralize its government? a. to increase trade with neighboring luxembourg b. to decrease the political power enjoyed by the flemish c. to enable belgium to join the european union d. to reduce tensions between belgium's two main ethnic groups

In a class of 20 students, what democratic form of governance makes the most sense