Answer the following question given this paragraph: 

This image depicts a true wonder of nature. This tiny human sperm is penetrating a much larger egg. These two cells will unite to become a brand new human being. The process in which they unite is called fertilization.


Q: The process in which a sperm unites with an egg is called?

 Choices:

- absorption

- infection

- migration

- fertilization

A:
fertilization
