by providing factual information to support the authors point of view
Gravity is one reason but also it depends in the speed, if the wave is fast, it will go higher and then bend. hope i helped :D
i beleive that is the respiratory system but ill double check in a m inute
alright heres all your answers for that test question 1 true
question 2 oxygen question 3 carbon dioxide question 4 true question 5 alvoei question 6 diaphram question 7 respitory system the last 3 are all true i hope i helped