I will give you 20 points who every answers this one!
Which of the following is true about mutation?
a. Mutation comes from artificial selection.
b. Mutation is always harmful to an organism’s survival.
c. Mutation is always helpful to an organism’s survival.
d. Mutation can come from environmental changes.

answer; i believe the correct answer is (a)0

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.