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

Fact 2: Opossums are a type of mammal called marsupials.

Given the two facts above, answer the question "what plays to learn how to behave?" with the following options: 
- opossums
 - humans
 - people
 - fish
 - exercise
 - ants
 - h2o
 - catabolism


 

 opossums        