Which best describes the purpose of a controlled experiment? A)to make sure the results of the experiment support the hypothesis B)to prevent a dangerous condition resulting from a reaction C)to examine whether one variable causes a change in another D)to prevent an undesired change in a variable

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

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.