From which germ layer do the liver and the pancreas originate?

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What is placenta? What are its functions?

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What are extra embryonic membranes? Name these layers in vertebrates?

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Where do liver and pancreas originate from?

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What is placenta?

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From which germ layer do blood cells originate?

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What are histogenesis?

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What is the function of the vitellus in the vertebrate egg?

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What is the main function of placenta?

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From which germ layer does coeloms originate?

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Explain the embryonic development stages after formation of blastula?

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To which structures do coeloms give birth? Are all animals coelomate?

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How is the yolk sac formed?

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What are other organs and tissues made from that germ layer?

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What is gastrulation? How during gastrulation are the &rst two germ layers formed? Which are these germ layers?

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