You are presented with the question "timing is critical for what occurs when a what and an egg fuse?" and the following answer choices: 
- Cooking
 - Flowers
 - fusion
 - embryos
 - pollen
 - seeds
 - heat
 - sperm

Now knowing that fertilization occurs when a sperm and an egg fuse and fertilization As far as fertilization, timing is critical, choose the best answer.


 

        sperm 