Explain how this experiment models a cell membrane. Use the following terms in your explanation: cell membrane, selectively permeable, diffusion, starch, iodine

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

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.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.