Assertion: whale shark's mouth | /r/MadeOf | up to 350 rows of teeth
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Source sentences:
text: These sharks have very wide mouths which can reach nearly 5 ft. wide and can contain up to 350 rows of teeth.
text: Their mouth, one of the most impressive features, can span almost 1.5m wide (5ft), containing up to 350 rows of teeth that work to filter plankton from the water.