Earth’s continents are constantly in motion because they sit on top of gigantic plates which float on earth’s mantle. energy from the earth’s core creates convection currents in the molten layer, and the currents move the plates. over extremely long periods of time, this movement creates new a. biomes b. plates c. atmospheric layers d. elements

the answer to your question is sperm

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.