True False 6. Menstrual fluid contains the lining of the uterus. True False 7. Eggs mature before they leave the ovary. True False 8.
Menstruation is caused by changes in hormones.
True False 9. The length of menstrual cycles may change during puberty. True False 10. Menstruation usually lasts between three and seven days. Permission is granted to reproduce for educational non-commercial uses if this message is shown.