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B
Semi-bony
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C
Cartilaginous
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D
None of these
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Solution
The correct option is A Bony
Exocoetus is the marine bony flying fish. They have bones as their endoskeleton. These fishes have teeth that are fixed onto the upper jaw and a swim bladder (an air-filled sac, allowing them to maintain buoyancy) that opens into the gullet. Bony fish need not swim in order to breathe (to push water through the gills).