Fertilization occurs when a sperm and an egg fuse.
Fertilization as far as fertilization, timing is critical.
Timing is critical for what occurs when a sperm and an egg fuse.
timing is critical for what occurs when a what and an egg fuse?

1. Cooking
2. Flowers
3. fusion
4. embryos
5. pollen
6. seeds
7. heat
8. sperm