You are presented with the quiz "When food and water decreases, what increases?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "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". 

So, what's the best answer to the question?


 

   Migration        