{"User":"@Mohsin90","timestamp":"2023-01-20 23:55:52","link":"ansr.ly/7acfd6&Mohsin90","answer":"Tortoise shell is hard because it is made of a protein called keratin, which is also found in hair and nails. The keratin in tortoise shell is arranged in a specific pattern, creating a strong and durable material. Additionally, the shell is reinforced by layers of calcium carbonate, which add extra strength and rigidity to the structure."}