Which type of rock would form if the sandstone rock in this image were put under a great deal of heat and pressure?
A intrusive igneous
B Extrusive
C sedimentary
D Metamorphic

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.