You are presented with the quiz "the egg implants itself in the uterus after sperm does what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fertilization occurs when sperm swim to an egg inside an archegonium" and "if fertilized, the egg implants itself in the uterus". 

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


 

       swim to an egg    