Chicken egg shown in this picture is an example of
an amniotic egg. Amniotic eggs are
shelled eggs that an embryo develops in. The chicken inside the pictured egg
would develop inside until it is ready to hatch. In the egg, the amnion
protects the embryo encased in a sac that is filled with amniotic fluid. Until
it hatches, the embryo feeds off the yolk in the egg. The inside of the shell
is composed of chorion, which helps get oxygen and carbon dioxide to the embryo
inside. The outside of the egg is made up of a calcium carbonate shell, which
protects it from harmful substances and allows it to submerge into water. It is
produced by reptiles, birds, and egg-laying mammals.
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