Formaldehyde is a volatile organic compound that is involved in the formation of photochemical smog in heavy metropolitan areas. What is most likely a direct source of formaldehyde in the atmosphere?

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 : )

c. live where it’s cold and icy