The element has three isotopes: one with an atomic mass of 12, one with an atomic mass of 13, and one with an atomic mass of 14.

1. I believe the answer is: We have a two-party system

In united states, the power within the government is controlled by two majority parties , the democratic party and the republican party. Each year, each of these party could appoint one candidate to fight for the presidential election to assert control on the white house.

2. I believe the answer is: Greece

Greece is known to be the first nation that introduced the concept of direct democracy. In their form of government, all Men could be involved in the government by giving them the rights to directly votes the laws/legislations that the country shall passed on the current year.