Flatworms have a coelom that is only partially surrounded with mesoderm. True or False?
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A)Cnidaria.
B)Platyhelminthes.
C)Annelida.
D)Arthropoda.
E)Nematoda.
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A)flatworms.
B)annelids.
C)cnidarians.
D)sponges.
E)comb
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