The alveoli of the lungs are surrounded by

The alveoli of the lungs are surrounded by tiny blood vessels called capillaries

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 think that you are smart and you should fit for it out