(A) https://www.youtube.com/watch?v=UPrxQkjjExI&t=416s  1 -What is calcitonin? Where is it made in the body? What effect does it have on the skeletal system and the blood?2 -What is a parathyroid hormone? Where is it made in the body? What effect does it have on the skeletal system and the blood?3 -What role do the bones play when blood calcium is too low? Too high?4 -What role do the intestines play when blood calcium is too low? Too high?5 -What role do the kidneys play when blood calcium is too low? Too high?(B)  https://www.youtube.com/watch?v=JhOU3FOyApM  1 -Describe the two different skeletons that started to evolve 558 MYA.2 -According to the video, what percentage of our total bones are in our feet? Hands?3 -Why did humans end up with our skeletons on the inside and insects on the outside?4 -What are the advantages of exoskeletons?5 -What are the disadvantages of exoskeletons?6 -What are the advantages of endoskeletons?7 -What are the disadvantages of endoskeletons?- Biology Science Physiology BIOL 201