What type of cell is created when a sperm fuses with an egg?

Zygote

Explanation:

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

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.