Which of these are parts of the appendicular skeleton? a. skull and mandible b. vertebrae and ribs c. humerus and phalanges d. ribs and sternum?

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.

allowed for the prediction of the properties of missing elements.