Final answer:
Class Anthozoa in Cnidaria primarily consists of corals and sea anemones, which are sessile species.
Explanation:
Class Anthozoa within the phylum Cnidaria predominantly consists of corals and sea anemones. These are sessile species, meaning they are stationary and attached to substrates. Sea anemones are brightly colored and cylindrical in shape, while corals are known for forming intricate reef structures.
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