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The answer is single opening. The gastrovascular cavity varies from the alimentary canal in that only the gastrovascular cavity has only a single opening. In addition, an alimentary canal has two openings and food moves over it unidirectional. The gastrovascular cavity is a construction establish in primitive animal phyla. It is accountable in cooperation with the digestion of food and the transportation of nutrients all over the body.
Answer: The correct answer is the following book:
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→ the "<em>Saunders Pharmaceutical Drug Book</em> " .
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Answer:
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Explanation:
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