Complete each sentence with a word or phrase from 3.

1. _______ refer to the plants and animals of a particular place.

2. Oceans, seas, rivers, and lakes are different types of _______ on Earth.

3. There are eight planets in the _______.

4. The Soviet Union launched Sputnik 1 into _______ in 1957.

5. Some examples of _______ include mountains, grassland, and deserts.