The creation of the was important because it is reusable, lands like a normal airplane, and eliminates the need to create a brand new spacecraft each time humans are launched into space.

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 : )

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.