Platyhelminthes Planarians What is the advantage of having a gastrovascular cavity that disperses throughout the body?
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members of the phylum Platyhelminthes have not developed a circulatory system. how is the flat shape of the planarian beneficial to its digestion, excretion, and respiration
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What are the advantages of cephalization? What effect did cephalization have upon the organization of the nervous system? Why might a bilateral animal that spends its days burrowing through sediment have radial symmetry? What could you do to determine the correct symmetry of such an animal? Interestingly, the phylum Platyhelminthes has no single defining anatomical feature comparable to the way that Cnidarians are unique in having cnidocytes. They are, however, all dorso-ventrally flattened. What are the possible advantages of being flattened in that plane? Can you think of any other animals that are flattened in the same plane? An alternative is to be laterally flattened. Can you think of any animals that are laterally compressed? What would be the advantage(s) of being flattened laterally? Platyhelminthes are triploblastic but have no coelom. What are the advantages of a coelom? Speculate on how flatworms are able to get by without a coelom.
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