The scales of many cartilaginous fishes are
pointed, giving the skin a rough texture.
located in pockets on the sides of the head.
located within the swim bladder.
smooth and slimy.
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By changing the amount of gas in the bladder, a fish can move up or down ... A tail that tapers to a point, as in lungfishes, vertebral column extends to tip without upturning. ... Thin, overlapping scales with a smooth posterior edge that are found in some .... Cartilage skeleton fish, tough skin, good sight, smell, vibration senses
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