Most marine animals form their shells from calcium carbonate, which is a tough mineral also found in limestone. Some sponges ...
Survival World on MSN
Shotgun shell anatomy and ballistics explained so shooters can understand what really happens after the trigger pull
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Hermit crabs have an odd housing situation. Rather than produce their own shells like other crustaceans, they must find an empty shell made by a completely different species, marine snails, in order ...
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