Its atomic mass determines its properties? hope this is correct
<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.
Alternative Splicing is a regulated process during gene expression that results in a single gene coding for multiple proteins.