Why doesn't water have to be pumped out of an artesian well?

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 the answer would be b. hope it : )

the tricuspid valve is present between right atrium and right ventricle

geologic time scale (for gradpoint) =)