fertilization is when a sperm and an egg are fused together
cross_fertilization is fertilization. external_fertilization is egg_fertilization. stratifying is reproductive_fertilization. self_fertilization is fertilization. stratifying is not reproductive_fertilization. egg_fertilization is not reproductive_fertilization. fertilization is creation. self_fertilization is not fertilization. egg_fertilization is reproductive_fertilization. fertilization is not creation.