1. What are the parts of the respiratory system? What is the system's function?
2. What are alveoli and what happens there?

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Respiratory system is the system of cells

1.) Now the respiratory system includes the nose mouth throat the windpipe, lungs. It is a network of orgns and stuff that help you breath. A respiratory infection is when you get a bunch of mucus and stuff built up in your body and it makes you sick so you have to take Brompheniramine

2.) The alveoli is where the lungs and the blood exchange oxygen  and carbon dioxde.

a polar bond is formed when electrons are shared unevenly between atoms

there is none because earth is stationary and flat.