11. Fossil fuels are considered nonrenewable resources because of - a. Where they come from
b. How they are produced
c. How useful they are
d. How long they take to

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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.