You are presented with the question "what requires penetration?" and the following answer choices: - gravity - weathering - gastropod shells - the skin - an object - death - Veins and arteries. - fertilization Now knowing that fertilization occurs when a sperm and an egg fuse to form a diploid zygote and penetration is when the sperm and egg meet and the sperm makes it way into the egg cytoplasm, choose the best answer.
The answer to this question is:
fertilization