Write two important differences between scales of reptiles and fishes.

Reptiles and fishes have distinct types of scales that differ in structure, function, and development. One major difference between their scales lies in their composition. Fish scales are primarily made of collagen and minerals like calcium salts, which form a hard, bony structure. The most common types of fish scales are cycloid, ctenoid, and ganoid, __________ _________ ______ _______ ________ _________ _______ _________ _______ ___ _____.
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