an animal requires a mate to fertilize an egg
embryo is animal. animal_breeding is animal_husbandry. attracting_mate is biological_process. mating_factor is mating_factor. external_fertilization is egg_fertilization. mating_of_haploids is mating. 1_sex is animal. mate is animal. egg_fertilization is reproductive_fertilization. attracting_mate is action_performed_by_animals.