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| Many sharks are protected by camouflage patterns that help them blend in their surrounding. |
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| Shark skeletons are made of cartilage, which is the same material that gives humans ears their shape. |
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| The dorsal fin, which sharks use to keep upright, sometimes sticks out above water. |
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| Many kinds of sharks are now in danger of extinction. |
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Definition
| It swallows very small ocean plants and animals, called plankton, that float on or near the ocean's surface. It swims with its enormous mouth open. |
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