Sharks {shark} are carnivorous and have heterocercal caudal fins, tough skin, and small scales.
Large northern sharks {basking shark} can be plankton eaters and swim slowly at sea surface.
Tropical sharks {hammerhead shark} can be medium-size, be live bearing, and have flat bar-shaped heads with eyes at ends.
4-Zoology-Kinds-Fish-Cartilaginous
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Date Modified: 2022.0225