Both are characterized by the presence of gamete producing glands, ovaries, or testicles, with the analogous processes of spermatogenesis and ovogenesis, as was seen earlier; these glands deliver their secretion in a more or less complex canal according to the hierarchy of the species: the female drops the egg directly by the oviduct and holds it in the cloaca or in a differentiated uterus before expelling it; the male either lets