You are presented with the quiz "What lasts only as long as the antibodies survive in body fluids?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "passive immunity lasts only as long as the antibodies survive in body fluids" and "breastfeeding provides passive and likely long-lasting active immunity". 

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


 

      breastfeeding provides     