The hardest part of the body of a vertebrate animal is Enamel. Enamel is the outermost layer of teeth and is primarily composed of hydroxyapatite, making it extremely hard and durable, even harder than bone.
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The hardest part of the body of a vertebrate animal is Enamel. Enamel is the outermost layer of teeth and is primarily composed of hydroxyapatite, making it extremely hard and durable, even harder than bone.