What are four of the male secondary sex characteristics?

Four male secondary sex characteristics are:

1. Broad shoulders and narrow hips. This is due to the increased production of testosterone during puberty, which causes the growth of muscle mass and the widening of the shoulders.

2. A deep voice. This is also due to the increased production of testosterone, which causes the vocal cords to thicken.

3. Facial hair. This is due to the increased production of testosterone, which stimulates the growth of hair on the face, chest, and other body parts.

4. Increased body size. Men are typically taller and heavier than women, and this is due to the increased production of testosterone, which stimulates the growth of bone and muscle tissue.