You are presented with the quiz "What can lead to the formation of multicellular embryo in venter?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "gametes then unite in fertilization and form a diploid zygote" and "diploid zygote forms multicellular embryo in venter". 

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


 

      Fertilization of gametes     