You are presented with the quiz "what has a positive impact on an animal 's ability to be a carrier for life?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "staying warm has a positive impact on an animal 's survival" and "animals that survive develop an immunity, but are also carriers for life". 

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


 

     staying warm      