Fact 1: Humans have collected and grown mushrooms for food for thousands of years.

Fact 2: Yeast and mushrooms are types of fungus.

Given the two facts above, answer the question "What living thing has collected and grown fungus as a source of food for thousands of years?" with the following options: 
- humans
 - grocery stores
 - honeybees
 - animals
 - pigs
 - fungi
 - trees
 - plants


 

 humans        