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While there is no fossil evidence directly to support this theory, it makes sense in light of the numbers of pharyngeal arches that are visible in extant jawed vertebrates ( the Gnathostomes ), which have seven arches, and primitive jawless vertebrates ( the Agnatha ), which have nine.

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While there is no fossil evidence directly to support this theory, it makes sense in light of the numbers of pharyngeal arches that are visible in extant jawed ( the Gnathostomes ), which have seven arches, and primitive jawless vertebrates ( the Agnatha ), which have nine.

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