1) Oceans play a crucial role in regulating the Earth's climate by absorbing and storing large amounts of heat and carbon dioxide.

2) The national animal of Australia is the kangaroo.

3) Democracy is a system of government in which power is vested in the people, who exercise it through elected representatives. It allows for political participation, freedom of speech, and protection of individual rights and liberties.

4) The Civil Rights Act of 1964 in the United States outlawed discrimination based on race, color, religion, sex, or national origin.