2x+6y=9 solve for x and y
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it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.

cell/ tissue/ organ/ organ system/ body