Approximately ___ percent of skin aging is caused by the rays of the sun. {Ans: 80-80%}Shampoo containing ingredients that are very effective in reducing dandruff or relieving other scalp conditions is called ___ shampoo. {Ans: medicated}Foul-smelling perspiration caused by bacteria is: {Ans: bromhidrosis}A(n) ___ is a physician who specializes in diseases and disorders of the skin, hair, and nails. {Ans: dermatologist}After an injury, infection, or disease, the natural nail will return to its healthy grown as long as the ___ is healthy and undamaged. {Ans: matrix}When shampooing a wig, it is recommended that you avoid shampoos that have a(n): {Ans: sulfur base}