Extraembryonic membranes vertebrates
Justify that are the extraembryonic membranes similar in all vertebrates?
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The presence of every extraembryonic membrane differs according to the vertebrate class. In fishes and amphibians just the yolk sac is present. In reptiles and birds apart from the yolk sac there are also amnion, chorion and allantois. In placental mammals besides all of these membranes, placenta is also present.
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Membrane: Membrane is any delicate sheet which separates one region from the other blocking or allowing (selectively or wholly) the passage of substances. The skin, for illustration, can be considered a membrane which separates the exterior from the i
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