Answer: That whenever any Form of Government becomes destructive of these ends, it is the right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles, and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness.
Diseases. To list some would be influenza, smallpox, etc.
None of them are really more powerful than any other they share the power and the all play a powerful role in our us government, to prevent any branch from becoming to powerful they would use a system called checks and balances.