Fact 1: An animal requires stamina to succeed at physical activities.

Fact 2: Humans are animals too.

Given the two facts above, answer the question "what requires stamina to succeed at physical activities?" with the following options: 
- mushrooms
 - Mammal
 - trees
 - bullfrogs
 - oxygen
 - Lobsters
 - humans
 - pigeons


 

       humans  