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Cuttlefishes and nautilus really rise to the occasion!
Much like their molluscan cousins, most cephalopods have shells—some are very obvious, like a nautilus’s shell, while others are much subtler, like the pen of a squid and the cuttlebone of a cuttlefish. Cuttlebones and nautilus shells are divided into chambers, so they can change the amount of gas and liquid in their shells to change their buoyancy. This allows them to move up and down in the water column with ease!
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