The Appalachian mountain range is made of folded rock layers. The presence of this folded range is evidence of which process of mountain formation? A. separation of two fault blocks
B. collision of two plates with each other
C. eruption of volcanoes near each other
D. deposition of sand and rocks from rivers

Fold mountains When plates collide or undergo subduction (that is – ride one over another), the plates tend to buckle and fold, forming mountains. Most of the major continental mountain ranges are associated with thrusting and folding or orogenesis.

Explanation:c:eruption of volcanoes near each othher..

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.