Most marine animals form their shells from calcium carbonate, which is a tough mineral also found in limestone. Some sponges ...
Seashells are abundant along coastlines, originating from mollusks that construct exoskeletons for protection. Comprised mainly of calcium carbonate, these shells possess enduring qualities that make ...
A sea turtle’s shell is living bone fused directly to its spine and ribs. It is not a detachable shield or an external case, ...
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