The developing embryo of reptiles,birds,and mammals is encased in the fluid-filled ________ membrane.

Name: The developing embryo of reptiles,birds,and mammals is encased in the fluid-filled ________ membrane.
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The amniotic membrane is the fluid-filled sac that surrounds and protects the developing embryo of reptiles, birds, and mammals. The other options (embryonic, chorionic, yolk sac, allantois) are also involved in embryonic development, but do not directly encase the embryo in fluid.

The Developing Embryo of Reptiles,birds,and Mammals Is Encased in the Fluid-Filled