1) A newborn kangaroo is about 1 inch (2.5 centimeters) long and weighs less than a gram.

2) The Indian Ocean is the third-largest ocean and is characterized by its warm waters and diverse marine life.

3) The United States operates under a two-party system, with the Democratic Party and the Republican Party being the two major political parties that compete in elections and shape the country's political landscape.

4) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.