Q:You are presented with the question "When is timing critical?" and the following answer choices: - a hemisphere is tilted away from the sun - object is kicked - movement of tectonic plates - flow of electrons - when the sperm and egg fuse - Earth revolving around the sun - Warm air moving into cold air - seed dispersal 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.
A:
when the sperm and egg fuse