You are presented with the quiz "Sperm had to swim from male to female reproductive organs to be what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sperm had to swim from male to female reproductive organs for fertilization" and "if fertilized, the egg implants itself in the uterus". 

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


 

      implanted in the uterus     