By applying mild electrical stimulation to parts of an animal's cortex, Gustav Fritsch and Eduard Hitzig triggered body movements. They discovered what is now called the

answer; i believe the correct answer to the above question is ( friction)

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.

that is wrong, its not thymus.

not only is it colder, it also becomes darker, less salty, and more dense.