The process illustrated here is somewhat different from those we have been studying, because the pressure change is due to changes in the amount of gas in the lung, not to temperature changes. (think of your own breathing. your lungs do not expand because they've gotten hot.) if the temperature of the air in the lung remains a reasonable 20 ∘c, what is the maximum number of moles in this person's lung during a breath?

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

ya the other dude is right