Explain gastrulation? What stage follows gastrulation?

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How is the neural tube formed? What is the embryonic origin of the nervous system in vertebrates?

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From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer?

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What is coelom?

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How does the embryo turn from gastrula into neurula? How is the neural tube formed?

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

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How is the yolk sac formed?

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What is coelom? To which structures do coeloms give birth?

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What are the destinations of the archenteron and of the blastopore?

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How does the embryo turn from gastrula into neurula?

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Genetically what are the two types of twins that can be generated?

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What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and of the blastopore?

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What are the archenteron and the blastopore?

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To which structures do coeloms give birth?

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What is the embryonic origin of the nervous system in vertebrates?

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