If the amount of available food and water decreases in an environment then animals may leave that environment to find food and water, and many animals migrate, traveling to avoid bad weather, to find food, or to reproduce. Given these facts, when food and water decreases, what increases among the following options:
- energy usage
 - heat energy
 - Migration
 - Temperature
 - Pollution
 - forces
 - root growth
 - deforestation


 

   Migration      