What distinguishes passive diffusion from other types of diffusion?
A) Passive diffusion transports only certain molecular species from a region of high to a region of low concentration.
B) Passive diffusion always transports material from a region of high to a region of low concentration.
C) Passive diffusion requires special processes and structures within the membrane to be present.
D) Passive diffusion requires a threshold concentration gradient to be present, before it can take place.
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