Rays give birth

Rays, which are cartilaginous fish, are internally fertilized, and are viviparous sharks and rays, whose development begins with yolk nutrition,
However, when the yolk is exhausted, it communicates with the so-called uterus at the lower part of the fallopian tube through the yolk sac (with many villi on the inner wall), receives nutrition from the mother, and shows a state similar to the true viviparity of mammals.