What happens during photosynthesis?
a. heterotrophs consume atp
b. heterotrophs produce atp
c. autotrophs consume organic molecules
d. autotrophs produce organic molecules

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

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.