Fact 1: Playing is one way mammals and other animals learn how to behave.

Fact 2: Playing is really fun.

Given the two facts above, answer the question "What is one way mammals learn to behave?" with the following options: 
- sleeping
 - motion
 - sweating
 - Having fun
 - Movement
 - magic
 - during the day
 - disease


 

    Having fun     