Involves comparing the costs and benefits of consuming or producing one additional unit of a good or service.

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 : )

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.

because it travels in smaller waves then all other colors, causing it to be the most visible color