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11 January, 17:23

Which of the following combinations correctly matches a phylum to its description?

a. echinodermata - bilateral symmetry as a larva, water vascular system

b. nematoda - segmented worms, closed circulatory

c. cnidaria - flatworms, gastrovascular cavity, acoelomate

d. platyhelminthes - radial symmetry, polyp and medusa body forms

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  1. 11 January, 17:27
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    The answer is B

    The phylum Nematoda (roundworms) is one of the most common phyla.

    There more than 15,000 known species of roundworms, however, there are many thousands of individual varieties nematodes, as well.
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