Which of the following secretary sex characteristics do not develop during the teen years
1. Breast development: This typically starts during puberty around the ages of 8 to 13 and continues through the teen years.
2. Widening of hips: This is a gradual process that usually occurs during puberty and continues until the late teens or early twenties.
3. Growth of pubic and underarm hair: This also starts during puberty and continues throughout the teen years.
4. Menstruation: Typically begins around the age of 12 to 14, although the timing can vary.
5. Enlargement of the uterus: This occurs during puberty as part of the normal development of the reproductive system.
6. Maturation of the reproductive organs: This typically happens during puberty, with the ovaries, fallopian tubes, and uterus developing and becoming functional.
Therefore, all of the listed sex characteristics generally develop during the teen years.