9. In one or two sentences, describe how the available energy may affect the population sizes of organisms at different trophic levels

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.

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate