In Echinoderms, gas exchange often occurs through thin-walled protrusions of the coelom called:
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Correct answer: Dermal branchiae
Dermal branchiae, also called papulae, are thin-walled, finger-like extensions of the coelom that project through gaps between the calcareous ossicles. They increase surface area for the diffusion of oxygen and carbon dioxide between coelomic fluid and surrounding seawater.
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