Gather your students together. Show them two objects–one real and one artificial and ask what they have in common (e.g. a potted plant and a stuffed animal). Write their answers on the board for future use. Ask students if one of the objects is alive. How do they know? Tell students that there are ways to determine if something is a living thing or a nonliving thing. Write down new vocabulary as it is discussed to solidify concepts taught. Ask students to think about how they know if something is alive.