What are the microscopic, tooth-like structures covering a shark's skin that reduce drag and help them swim quietly?
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Also known as placoid scales, dermal denticles are structurally similar to tiny teeth, complete with dentin and enamel. They point backward to channel water efficiently over the shark's body, reducing turbulence. This unique texture has even inspired the design of high-tech swimsuits and drag-reducing coatings for airplanes. Photo: P.j.alfaiate, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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