Fact 1: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Fact 2: Penetration is when the sperm and egg meet and the sperm makes it way into the egg cytoplasm. Given the two facts above, what requires penetration?

Available choices:
A). gravity
B). weathering
C). gastropod shells
D). the skin
E). an object
F). death
G). Veins and arteries.
H). fertilization
The answer is:
H).