Any help would be perfect! Thanks!

What is the purpose of the system of checks and balances

Explain the strengths of the articles of confederation and how people reacted to this document. ! ^^^ 10 points

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste