Question

Borstein et al. 2024 rejects the hypothesis that evolution of this structure is a key innovation in cichlids. In certain fish, the first pair of branchial arches develops into this structure. VDJ (0[1])recombination is a synapomorphy of the clade of vertebrates named for possessing this structure, (20[1])which is analogous (0[1])to rotifers' trophi. The (20[1]0[1])morphology of this structure distinguishes teleosts from other fishes (0[1])in Gnatho·stomata. (20[4])(*) Moray eels have a second (10[2])retractable (10[3])instance (10[2])of this (10[2])structure, (10[7]0[2])which (10[1])is missing in hagfish and lampreys. (10[1])This structure (0[1])can feature (10[1])the premaxilla and the mandible, (10[1])which (10[1])is the only (10[1])independently (10[1])movable part of the human skull. For 10 points, name this structure that enables chewing. (10[1])■END■ (10[6])

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