Cartilage is more flexible than bone due to its composition and structure, allowing it to be folded, while bones are rigid and cannot be bent.
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The flexibility of cartilage in the ears allows them to fold, facilitated by their composition rich in collagen and elastic fibers. In contrast, bones in the arms are rigid due to their dense mineralized structure composed of calcium phosphate and collagen, making them incapable of bending. The distinct compositions of cartilage and bone dictate their respective abilities to fold and withstand bending.