I'm so confused and i can't find the answers anywhere

5. Most politicians are either republicans or democrats and therefore few people follow third part systems
6. Pro: there is some degree of a balance of power in government
    Con: politics has become more about each party dominating rather than protecting the country
7. In one party systems, various candidates of the same party run against each other
8. Wealthy people tend to be republicans, working class people tend to be democrats 

One party works when all the member inside the group cooperate 

Reserved powers is your answer