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

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From which germ layer do the epidermis and the nervous system originate?

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What is gastrulation? How during gastrulation are the first two germ layers formed?

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What is coelom? Are all animals coelomate?

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What is gastrulation?

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How is the notochord structure formed?

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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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Define polyembryony?

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What are pericardium?

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What is the main function of placenta?

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How during gastrulation are the first two germ layers formed?

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How notochord structure id formed?

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What are pleura?

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What are peritoneum?

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What is the morphological feature that defines that stage?

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