You are presented with the quiz "Sperm and egg nuclei combine to do what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fertilization of gametes produces a diploid zygote" and "sperm and egg nuclei combine to form the diploid zygotic nucleus 2". 

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


 

   fertilize gametes        