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They were of use in swimming, and sections of them were stiffened with rods of cartilage, and became the pairs of fins. Some experts think, however, that the fish developed directly from a Crustacean, and hold that the Ostracoderms are the connecting link. Directly or indirectly, the fish is a descendant of some Archaean Annelid. It is most probable that the shark was the first true fish-type.
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