The enzyme present in human tears, which kills bacteria, is Lysozyme. Lysozyme is an antimicrobial enzyme that breaks down bacterial cell walls, helping to protect the eyes from infection.
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The organ that is not considered a vestigial organ is Diaphragm. The diaphragm is a vital muscle involved in the process of breathing and is not considered vestigial, unlike structures such as the appendix or centriole.
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.
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.