Fertilization occurs when a sperm and an egg fuse to form a diploid zygote.
Penetration is when the sperm and egg meet and the sperm makes it way into the egg cytoplasm.
Fertilization requires penetration.
what requires penetration?
(a) gravity
(b) weathering
(c) gastropod shells
(d) the skin
(e) an object
(f) death
(g) Veins and arteries.
(h) fertilization