1pt Which of the following statements about the female reproductive system is NOT true?
A. The vagina is also called the birth canal.
B. A fertilized egg cell will implant into the wall of the uterus.
C. The ovaries produce the female sex hormone, testosterone.
D. A sperm cell will fertilize an egg cell in the fallopian tube.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.