Explain why mining soil loss on sloping land is better achieved by measures that retain much of the original vegetation cover rather than extensive clearance followed by replanting

it is either c or d and i know for sure it is not a or b

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.