Which of the following are motile zooids in cnidarians?
Correct answer: B. Medusae
- A. Polyps
- B. Medusae
- C. Both of these
- D. None of these
Explanation
Medusae are the free-swimming, motile zooid form of cnidarians, whereas polyps are generally attached and cylindrical. Students may choose c because many cnidarians show alternation between polyp and medusa forms, but only the medusa is the motile form in this comparison.
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