Which correctly identifies the cells above

a. x cells i animal cells and y cells are plant cells
b. x cells are plant cells and y cells are animal cells
c. x cells and y cells are animal cells.
d. x cells and y cells are plant cells

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

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.