Fertilization occurs when a sperm and an egg fuse.
Fertilization as far as fertilization, timing is critical.
Timing is critical when a sperm and an egg fuse.
When is timing critical?
Options:
A: a hemisphere is tilted away from the sun
B: object is kicked
C: movement of tectonic plates
D: flow of electrons
E: when the sperm and egg fuse
F: Earth revolving around the sun
G: Warm air moving into cold air
H: seed dispersal