American governments

I need help to research the three branches of American government: legislative, executive, and judicial.  Prepare a 1-2 page paper describing the following for each branch:

–          Composition (who is part of this branch of government)

–          Term (how long do they serve)

–          Powers/authority

–          Who/what can override its decision

–          What decisions of others can it override

–          What is the difference between that branch of government at the federal level, and that branch of government at the state level?

Some starting points for research are the US Constitution) and the following websites:

–          USHistory.org/gov

–          http://ed.ted.com/lessons/how-is-power-divided-in-the-united-states-government-belinda-stutzman

All sources should be cited.