First, ___1 are produced in two almond-shaped organs known as the 2. During the process of 3, a mature egg (4) is released and enters one of the two 5 . For a few days, the egg cell travels toward the pear-shaped 6. The lining of this organ thickens in preparation for a fertilized egg. If the egg is not fertilized by the male 7 , it will leave the body together with the lining of the uterus and a small amount of blood. This is called 8. The lower portion of the uterus is called the 9 and is a common site of cancer in women. The female organ of intercourse is the 10. A circular fold of skin is usually present at the entrance to this organ and is called the 11. Outside of this organ are folds of skin covered with pubic hair known as the 12. Between these skin folds is a small, round, sensitive area of skin called the 13. The development of the reproductive system is triggered by the hormones 14 and 15, which cause many physical changes in a girl. This period of change is called 16.