Why do you not find humus on slopes? lack of dense vegetation too much topsoil lack of rainwater abundance of nutrients?

lack of dense vegetation

Explanation:

Humus is the product resulting from the decomposed organic matter, from the digestive process of earthworms, forming a natural compost, adding to the soil the remains of animals and dead plants and also their by-products. This organic matter is a result of the fall of plant material in the soil, for this reason, areas with dense vegetation have soil rich in humus, however areas such as hillsides that do not have dense vegetation are poor in humus.

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

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 : )