It's annoying, and harmful to health.
You want to sleep, but you can't. You try to work, but you don't have the energy.
Insomnia is a serious problem that can be harmful to teenagers.
Vitamin D is awesome to use when I need it
1) respiratory system is made of the windpipe lungs diaphragm alveoli takes in oxygen and waste
2) breathing allows you to take in the oxygen your cells need and expel carbon but when you breathe you loose water.
3) the lungs are the only organs that can float on water bc it is holding 300 million ballon like structure called the alveoli
