animal phylum assign

animal phylum assign - Identify a class within phylum...

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Iowa State University Biology 211 Section 2 Digestive and Circulatory Systems 1. Question: Distinguish between complete and incomplete digestive systems. Indicate one phylum that has incomplete digestive systems and one phylum that has complete digestive systems. (3pts) Answer: An incomplete digestive system, such as phylum Cnidaria, is an animal with an incomplete digestive system because, unlike complete digestive systems, an incomplete digestive system has no anal opening! A complete digestive system, Phylum Mollusca, has both a mouth and an anus! 2. Question:
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Unformatted text preview: Identify a class within phylum mollusca that possesses an open circulatory system and a class within phylum mollusca that possesses a closed circulatory system. What are the distinctions between open and closed circulatory systems? (3pts) Answer: Class Bivalvia has an open circulatory system. Animals with open circulatory systems have no capillaries. Class Cephalopoda has a closed circulatory system. In closed circulatory systems the blood travels from the heart to the capillary beds and drains back to the heart through the veins....
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animal phylum assign - Identify a class within phylum...

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