The part of the human body that cannot be transplanted is Brain. Unlike organs such as the kidney, heart, and lung, which can be transplanted to replace damaged or diseased tissue, the brain cannot be transplanted.
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The part of the human body that exhibits regeneration is Liver. The liver has remarkable regenerative capabilities, allowing it to replace damaged or lost tissue and restore its functionality after injury or partial surgical removal.
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.
The hardest substance in the human body is Dentin. Dentin is a calcified tissue that forms the bulk of a tooth, providing structural support and protection. It is harder than both bone and nail.
The upper surface of the skin is called Epidermis. The epidermis is the outermost layer of the skin, providing a protective barrier against environmental factors and containing cells responsible for pigment production and keratinization.