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Hagrid
The outer layer of the skin that makes the body waterproof, gives it color, and helps to maintain hydration levels is the melanin. This is the reason why we have different colors of skin. The rest of the choices do not answer the question above.
The best answer to the question above would be the epidermis. The outer layer of the skin that is responsible for the body's waterproof quality, gives it color, and makes hydration levels is the epidermis - which is the outermost layer of all the skin layers.