This is a picture of a chicken egg. A chicken egg represents one of the examples of an amniotic egg. Amniotic eggs are produced by reptiles, birds, and any egg-laying mammal. The egg contains an embryo that is surrounded by a amnion filled with amniotic fluid. The outer shell (either calcium-based, or leathery), the amnion, and the amniotic fluid act as a protective layer for the embryo to survive. The yolk sac that is attached to the embryo is the membranous sac that delivers its nutrients.
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