You are presented with the quiz "What involves a sperm and egg fusing to form a diploid zygote?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fertilization occurs when a sperm and an egg fuse to form a diploid zygote" and "sexual reproduction requires formation of gametes, followed by fertilization". 

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


 

    sexual reproduction       