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Two that come to me immediately: The shark's skeleton is cartilage rather than bone, of course, and the shark lacks the ability to suspend and still be able to force water over it's gills. Sharks never stop moving from the minute they are born until they moment they die - they must move forward at all time to force water over their gills, else they would suffocate.

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12y ago
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Q: What features separate the shark from the bony fishes?
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