Political Science Question

I need help with 2 essay qustions.  They are at least 500 words each and citied sources.

Question 1

Please explain how the Constitution provides for a system of separation of powers and checks and balances. Provide a fully developed essay of at least 500 words, and cite sources used. 

Question 2

Describe how a bill becomes a law at the national level, in a fully developed essay of at least 500 words. Support your work with cited sources, references to Lecture Notes, or URLs where you obtained your information.