Fact 1: Fertilization occurs when a sperm and an egg fuse.

Fact 2: Sperm and eggs are cells known as gametes.

Given the two facts above, answer the question "Fertilization occurs when _ fuse." with the following options: 
- fertile
 - sperm ducts
 - heat
 - eggs
 - seeds
 - gametes
 - pollen
 - ovaries


 

      gametes   