Suppose you want to perform a scientific investigation to find out how high a ball bounces on diferent kinds of surfaces. What are appropriate materials to reference before beginning your investigation? What are examples of
appropriate reference materiais?

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 : )

occluded front i think