When does the embryo form? O A. A few days after fertilization
O
B. In the second trimester
O C. At the end of the first trimester
O D. At the end of the third trimester
Please help me

atp is used for energy.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )