The uneven heating of the atmosphere by the sun's energy creates pressure differences.

Which effect is a direct result of this?
A) formation of clouds
B) generation of winds
C) occurrence of lightning
D) an increase in humidity

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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.