Most desert streams are depleted before reaching the ocean due to a. flash flooding and sedimentation b. evaporation and soil infiltration c. siltation and sedimentation d. condensation and soil infiltration

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.