Nava de război Mlaştină civilizaţie amnios chorion sac vitelin alantoida a lua legatura necondiţionat venin
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extra embryonic membranes : amnion chorion allantois and yolk sac ...…
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A text-book of agricultural zoology. Zoology, Economic. DEVELOPMENT OF MAMMALIA. 429 attached to the parent by means of a membrane called the placenta, which more or less closely unites the foetus