No, tuna fish do not have placentas. The placenta is part of mammal physiology, and fish are not mammals.
Umbilical Cord
Placenta previa, placenta accreta, placenta increta, and placenta increta are all conditions stemming from abnormal implantation of the placenta.
Placenta comes out after each kitten.
how nutrients,oxygen and waste are exchange between the fetus and the mother
The umbilical cord is attached to the placenta and the placenta is attached to the wall of the uterus
Yes. But the movement is relative. Placenta does not change the position. But lower placenta may move up. So that placenta previa may become normal placenta.
Placenta Previa
Yes kangaroos have a placenta.
Tuna
Tuna is called tuna because tuna is fish. The breed of fish is called Tuna noooooo. ofcourse not. tuna is called tuna since the fish of tuna does not equal salmon so tuna can be sometimes defined as tuna rather than tuna so that the tuna species of tuna are tuna is like the tuna tuna . get tuna it? tuna? Haha very funny!! When I read it I was rolling on the floor in mirth! WHAT THE HELL IS MIRTH?
The plural of tuna remains tuna.
there is no rat in tuna TUNA IS MADE OF FISH