Explain the difference between herbivores, carnivores and omnivores​

Herbivores are organisms that eat plants only. Carnivores are organisms that eat other animals only (meat). Whereas, omnivores are organisms that eat both plants and animals.  

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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.