4. During a menstrual cycle the lining of which organ changes?
ovary
testes
fallopian tubes
uterus
5. Which range describes when puberty normally begins?
between 2 and 7 years old
between 8 and 16 years old
between 17 and 21 years old
between 25 and 30 years old
4. During a menstrual cycle, the lining of the uterus changes.
5. Puberty normally begins between the ages of 8 and 16 years old.