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In the sentence "Roundworms have mechanoreceptors called _____ on external bristles", the word that correctly completes the sentence is B. setae. Roundworms or nematodes are a diverse animal phylum. The main sense organs of roundowrms are setae, papillae, and amphids. They use setae as mechanoreceptors to detect motion.

robertgraham2002

setae is the right answer

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