Which statement describes an advantage of renewable resources? a. they are cheaper than traditional energy sources b. they are a source of clean energy c. they are located everywhere around the world d. they are an affordable means of energy production

B. They are a source of clean energy, i just took the test..

your a sped   no one cares

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.