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1. a fish that has a flexible skeleton made of cartilage is known as a . 2. a row of organs that are sensitive to changes in water pressure is called a . 3. a fish that has muscular pectoral and pelvic fins supported by rod-shaped bones is known as a . 4. movement of the allows some fish to breathe without swimming. 5. a fish that has a bony skeleton and thin, flexible supports in its fins is known as a . 6. the gas-filled sac found in many fishes is called a .
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1. a fish that has a flexible skeleton made of cartilage is known as a . 2. a row of organs that are...
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