Your answer is B weathering, deposition, and erosion :D i really hope i helped you!
Answer:
I am a in
Explanation:
I apologize I don't know the answer
<h3> Answer</h3>
alveoli
<h2> Explanation</h2>
During gas exchange oxygen moves from the lungs to the bloodstream. ... This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.