Cuttlefish have an internal shell or ____and nautilus have a ____ shell
bone spiral chambered
Cuttlefish have an internal shell called a cuttlebone, which is made of calcium carbonate and provides buoyancy control for the animal. On the other hand, nautilus have an external spiral shell, which is also made of calcium carbonate and protects the animal from predators. The nautilus shell is divided into compartments that the animal can fill with gas or water to adjust its buoyancy and control its depth in the water column.
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