The pincer-like structures on the surface of some echinoderms that keep the body free of debris and parasites are:
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Correct answer: Pedicellariae
Pedicellariae are minute, pincer-like appendages located on the body surface of sea stars and sea urchins. They snap shut to dislodge debris, remove parasites, and prevent encrusting organisms or settling larvae from colonizing the echinoderm's skin.
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