List each purpose of
government and explain why
each is necessary.

The three different branches of government include Legislative, Judiciary, and Executive. The different branches work with checks and balances to keep each other "in check." THinking about it, is that where the phrase, "in check" comes from?

Why each are important:

The Legislative makes the laws. (Congress, Senate, and House of Representatives)

The Executive enforces the laws.

THe Judiciary interprets the laws.  

the above statement/question is (true);