In Platyhelminths differ from cnidarian
A) since cnidarians have only two cell layers.
B) because Platyhelminths have a mesoderm which leads to organ formation.
C) because cnidarians have a skeleton of calcium carbonate.
D) as Platyhelminths have an excretory system which opens into the archenteron adjacent to the mouth.
E) since platyhelminths are parasites of vertebrates.
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