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Hair processes faster at the scalp because of two factors: body heat and:

  1. Blood circulation

  2. Exposure to sunlight

  3. Incomplete keratinization

  4. Scalp oil production

The correct answer is: Blood circulation

Hair processes faster at the scalp because of two factors body heat and blood circulation. The scalp has more blood vessels than other parts of the body, providing a constant supply of nutrients and oxygen to the hair follicles. This, combined with the body's natural temperature regulation mechanisms, results in increased body heat at the scalp which further speeds up hair processes. Exposure to sunlight (option B) does not affect hair processes as UV rays do not penetrate the skin deep enough to reach the hair follicles. Incomplete keratinization (option C) refers to a skin disorder and is not related to hair growth. Scalp oil production (option D) can contribute to the health of the scalp and hair, but it does not directly affect the speed of hair processes.