Compare the productivity of terrestrial and aquatic ecosystems against the percent of Earth’s surface area they occupy.

answer; /// the correct )

substitution is the answer in this case

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.