How are fertilization and reproduction opposites?

Fertilization and reproduction can be seen as opposites in that fertilization specifically refers to the union of sperm and egg to form a zygote, marking the beginning of a new organism's development. In contrast, reproduction encompasses the entire process of producing offspring, which includes fertilization as well as subsequent stages like gestation, birth, or vegetative propagation. While fertilization initiates the creation of new life, reproduction involves the broader biological strategies for sustaining species over time. Thus, one is a singular event, while the other is a comprehensive cycle.