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Which class of Coelenterate contains both polyps and medusas?

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Scyphozoa

Anthozoa

Hydrozoa

All of the above

answer is A.

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Detailed Solution

Hydrozoa Cnidarians have two basic body forms: polyps and medusas.

The former is sessile and cylindrical, similar to Hydra and Adams, whereas the latter is umbrella-shaped and free-swimming, similar to Aurelia or jellyfish. These Cnidarians, which exist in both forms, show generational alternation (Metagenesis),

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