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How seashells shaped the world — and predict our future
The Gray Area with Sean Illing
What Are Sea Shells and the Marine Mollusks?
Sea shells are made by the wondrous creatures that live inside of them, the marine mollusks. There are about 50 thousand of them known, but scientists suspect that's only about a third of those knowable. Mollusks are the second largest animal group in the world behind arthropods.
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