Which of the following is not an example of chemical weathering?
a.
natural plant acid breaking down a rock
c.
oxidation of metals
b.
acid rain deteriorating a marble statue
d.
ice wedging in rock

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.

garbage disposal because lysosomes dispose of old cell parts like garbage disposals dispose of old food.