You are presented with the question "What is formed when a sperm and egg unite in fertilization?" and the following answer choices: 
- a haploid
 - two sperms
 - rapid expansion
 - gastropod shells
 - Chemical energy
 - peachleaf willow
 - an infant human
 - a diploid zygote

Now knowing that gametes then unite in fertilization and form a diploid zygote and sperm and eggs are cells known as gametes, choose the best answer.


 

        a diploid zygote 