Julia plants three tomato plants in different types of soil to see which is best for gardening. all three tomato plants are the same variety. they are about the same size at the start of the experiment. each plant receives the same amount of water each day. the independent variable is the

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.

i think the answer is b.