The cells that form from the first few divisions of a fertilized egg cell can develop into any cell in the human body or the placenta. what kind of stem cells are these?

but there is no

i guess you forgot putting it.

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.