Which of the steps described in the item above (variation, selection,
and/or inheritance) are affected by the prior exposure of bed bug
populations to ddt? how are those steps or step affected?

the organisms are not adapted to live in some communities or habitats.

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 : )