Allantois formation Embryonic folding 3D overview Animated Embryology 3rd Week

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View full lesson: http://ed.ted.com/lessons/the-game-ch... • 350 million years ago, eggs could not survive far from water, therefore animals were water-bound. That is, until the amniotic egg, which allowed animals to live a fully terrestrial life. April Tucker peels back each layer of the amniotic egg, revealing how truly extraordinary this evolutionary marvel is. • Lesson by April Tucker, animation by Pew36 Animation Studios.

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