This is an organic substance made of the elements c, h, and o; it is usually found in long chains in lipids; a glycerol and three of these form a fat or lipid. what is the substance?

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.