WILL GIVE BRAINLIEST - How has the concentrations of the greenhouse gases in the atmosphere change from the Ice Age to today? A. The concentration of the greenhouse gases has decreased since the Ice Age
B. The concentration of the greenhouse gases has slightly increased since the Ice Age
C. The concentration of the greenhouse gases has greatly increased since the Ice Age
D. The concentration of the greenhouse gases has not changed over time

the correct answer is option C

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.

c should be the answer