Desertification is caused by a combination of converging problems, including: A. overgrazing, deforestation, drought, and climate change.
B. urban sprawl, pesticide contamination, and natural cycles.
C. contamination of irrigation water and natural cycles.
D. famine, starvation, and biodiversity loss.

A. overgrazing, deforestation, drought, and climate change.

Explanation:

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.