With respect to proteins, the quaternary structure refers to the

refers to the number and arrangement of protein subunits

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.

multiplying and dividing the two decimals and the eqations by the same number of the overalls