Fertilization targets are the cells that must be united in order for fertilization to occur. The two main targets of fertilization are OVA (also known as egg cells) and novae (also known as sperm cells). OVA are produced by female organisms, while novae are produced by male organisms. When these two cells meet, they form a zygote, which is the first stage of a new organism. Fertilization is an essential part of reproduction in many species.