This is a picture of an egg. This egg is an example of an amniotic egg. An amniotic egg is an egg with a fluid filled sac or membrane. The egg of a chicken is surrounded by a hard shell to protect the embryo in the amniotic fluid. The yolk in the chicken egg feeds nutrients to the embryo in the amniotic sac. Reptiles, birds, and egg-laying mammals all produce amniotic eggs.
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