Which statements apply to both the processes of diffusion and facilitated diffusion? Check all that apply.

Both diffusion and facilitated diffusion are passive transport, so neither requires cellular energy. In both processes, particles move down their concentration gradient, from an area of higher concentration to an area of lower concentration. Simple diffusion does not use carrier proteins, and facilitated diffusion is used for substances that cannot cross the membrane directly, so A and C do not apply to both.

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