What sort of variations did you see within the classes of Cnidaria?

Classes of cnidarians

Modern cnidarians are generally classified into four main classes: sessile Anthozoa (sea anemones, corals, sea pens); swimming Scyphozoa (jellyfish) and Cubozoa (box jellies); and Hydrozoa, a diverse group that includes all the freshwater cnidarians as well as many marine forms, and has both sessile members.

Explanation: Hopefully this helps!

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answer; i believe that the correct answer is (lung);