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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 else can I help you with?
What is a mammal bird called?
There isn't a mammal-bird.
Why is it necessary for insect reptile and bird eggs to store large amounts of yolk?
The developing baby inside a mammal is nourished internally by the mother until the baby is ready to be born. In an egg, the only nourishment available to the developing young is the yolk sac.
Is a tropical bird a mammal?
No. Whether it is tropical or not, no bird is a mammal.
What is the name of the Extinct bird that was a mammal?
There is no such thing. No bird is or ever was a mammal.
Is budgerigar a mammal?
No. A budgerigar (budgie) or parakeet is a bird, not a mammal.
What is a eland a mammal or a bird?
A mammal.
Is a whale mammal or a bird?
mammal
Is a peniguin a mammal or bird?
Bird
Is a kea a mammal?
The Kea is not a mammal. Its a bird.
Is a chickadee a mammal?
A chickadee is not a mammal. It is a bird.
How is a Stork a mammal?
A stork is not a mammal. It is a bird.
Is a kiwi bird a mammal or bird?
The Kiwi is a bird.
