Explain why a plant cell needs a cell wall but an animal cell does not. Feel free to add an image to support your explanation.

the index of refraction of the second medium is higher. i just took the test trust me !

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.