If asperm and an egg unite in fertilization and form a diploid zygote, then what is formed when a sperm and egg unite in fertilization?

Answer choices:
- a haploid
 - two sperms
 - rapid expansion
 - gastropod shells
 - Chemical energy
 - peachleaf willow
 - an infant human
 - a diploid zygote

 

        a diploid zygote  