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Can you be Pregnant with three yolk sac what does that mean?
three yolk sacs means three babies.
If you have twins in separate yolk sacs is this good?
yes
How do the mother crocodile feed her babies?
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.
What part of the egg acts as the placenta in mammals?
The allantois, yolk sac and part of chorion.
Why are some chicks hatched with their yolk sac stil attached?
Left over or unused nutrients. This will drop off as does the umbilical cord on a mammals new born.
Why do mammals have small eggs compared to birds?
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.
What part of the chicken egg acts as placenta in mammals?
The allantois, yolk sac and part of chorion.
Do bullfrogs have amnion sacs?
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.
Why is there no large yolk in a mammal embryo?
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.
How do mother fish feed their babies in the ocean?
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 what is to a mammal?
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.
What is effect of yolk on cleavage?
Yolk affects cleavage by influencing the type and pattern of cell division during early embryonic development. In species with a high yolk content, such as birds and reptiles, cleavage is often discoidal and meroblastic, meaning that only a portion of the zygote undergoes division due to the large yolk mass. In contrast, organisms with little to no yolk, like many mammals, exhibit holoblastic cleavage, where the entire zygote divides uniformly. The presence and distribution of yolk ultimately determine the cleavage pattern and subsequent developmental processes.
