<P> In males, testosterone directly increases size and mass of muscles, vocal cords, and bones, deepening the voice, and changing the shape of the face and skeleton . Converted into DHT in the skin, it accelerates growth of androgen - responsive facial and body hair but may slow and eventually stop the growth of head hair . Taller stature is largely a result of later puberty and slower epiphyseal fusion . </P> <Ul> <Li> Growth of body hair, including underarm, abdominal, chest hair and pubic hair . Loss of scalp hair due to androgenic alopecia can also occur . </Li> <Li> Greater mass of thigh muscles in front of the femur, rather than behind it (as is typical in mature females) </Li> <Li> Growth of facial hair </Li> <Li> Enlargement of larynx (Adam's apple) and deepening of voice </Li> <Li> Increased stature; adult males are taller than adult females, on average </Li> <Li> Heavier skull and bone structure </Li> <Li> Increased muscle mass and strength </Li> <Li> Hands, feet and nose grow larger </Li> <Li> Larger bodies </Li> <Li> Face is square, with more angular features </Li> <Li> Small waist, but wider than females </Li> <Li> Broadening of shoulders and chest; shoulders wider than hips </Li> <Li> Increased secretions of oil and sweat glands </Li> <Li> Coarsening or rigidity of skin texture due to less subcutaneous fat </Li> <Li> Higher waist - to - hip ratio than prepubescent or adult females or prepubescent males, on average </Li> <Li> Lower body fat percentage than prepubescent or adult females or prepubescent males, on average </Li> </Ul> <Li> Growth of body hair, including underarm, abdominal, chest hair and pubic hair . Loss of scalp hair due to androgenic alopecia can also occur . </Li> <Li> Greater mass of thigh muscles in front of the femur, rather than behind it (as is typical in mature females) </Li>

Which of the following is an example of a secondary sex characteristic