You are presented with the question "Fertilization occurs when _ fuse." and the following answer choices: 
- fertile
 - sperm ducts
 - heat
 - eggs
 - seeds
 - gametes
 - pollen
 - ovaries

Now knowing that fertilization occurs when a sperm and an egg fuse and sperm and eggs are cells known as gametes, choose the best answer.


 

      gametes   