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Alveoli are folded to increase their surface area to volume ratio, so more volume of air can diffuse in from the blood and and in from the bronchioles. The lining of the alveoli walls are also moist so th...

I dislike pork meat, but I like beef.

Marta has brunette hair. 

dy/dx = 3x^2

Independent variable: the one that you change. 

Dependent variable: the one that you measure. 

For example, a scientist wants to find out whether a diet including oats makes a horse run fast...