Fact 1: If the amount of available food and water decreases in an environment then animals may leave that environment to find food and water.

Fact 2: Many animals migrate, traveling to avoid bad weather, to find food, or to reproduce.

Given the two facts above, answer the question "When food and water decreases, what increases?" with the following options: 
- energy usage
 - heat energy
 - Migration
 - Temperature
 - Pollution
 - forces
 - root growth
 - deforestation


 

   Migration      