Yes, mammals have yolk sacs. Although they may not be as easily noticeable as the yolk in a chicken egg, it is still there. The yolk contains proteins and fats needed for the embryos further development.
three yolk sacs means three babies.
yes
Two yolk sacs typically indicate a multiple pregnancy, such as twins. In early gestation, each embryo may develop its own yolk sac, which provides essential nutrients before the placenta takes over. The presence of two yolk sacs can suggest that the embryos are either identical (monozygotic) or fraternal (dizygotic), depending on how they were conceived. It's important to monitor such pregnancies closely for the health of both embryos.
Some babies live off a mucus the mother excretes or secretes, some babies are born with their own yolk sacs, and many are just on their own from birth.
The allantois, yolk sac and part of chorion.
Left over or unused nutrients. This will drop off as does the umbilical cord on a mammals new born.
Mammals (with the exception of the Monotremes) are formed in the womb and fed by the mother through the umbilical and not dependant on the yolk sac.
The allantois, yolk sac and part of chorion.
No, bullfrogs do not have amnion sacs. They are amphibians, and their reproductive process involves laying eggs in water, where the eggs develop into tadpoles. Amnion sacs are characteristic of amniotes, such as reptiles, birds, and mammals, which develop their embryos in a protective environment outside of water.
Mammal embryos don't require a large yolk becaues they are nourished directly by the mothers body. In contrast, birds, reptiles, and other (mostly) egg layers, need a large yolk because the yolk must nourish the embryo all the way through development.
Some babies live off a mucus the mother excretes or secretes, some babies are born with their own yolk sacs, and many are just on their own from birth.
A yolk is to a bird as a placenta is to a mammal. The yolk provides nourishment to the developing embryo in bird eggs, while the placenta facilitates nutrient and gas exchange between the mother and the developing fetus in mammals. Both serve vital roles in supporting development before birth.