Do kangaroos have an amnion?
The amnion is a membrane building the amniotic sac that surrounds and protects an embryo. It is developed in reptiles, birds, and mammals (including kangaroos), which are hence called "Amniota"; but not in amphibians and fish (Ichthyopsida), which are consequently termed "Anamniota". The primary role of this is the protection of the embryo for its development. It stems from parts of the mesoderm on the outer side and the ectoderm on the inner side. Thanks for asking ChaCha!
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