Essentially, when you breathe in the lung take in oxygen and pass it along to the bloodstream, which brings it to your bodies cells. In return it picks up carbon dioxide, which the lungs dispose of. Every time you breathe this process is happening. That is why it's crucial to keep your lungs healthy.
Covalent bond is indicated by the arrow.
Answer:
did you delete it or no? because that might've happened
Explanation:
it happened to me once
I would have to say conspiracy.
Answer:
cells
Explanation:
cells are responsible for the structures and functions
