You are presented with the quiz "what may leave an environment to find food and water if the amount available decreases?" 

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 "human beings are animals". 

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


 

       humans    