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When is facilitated diffusion necessary? a) when the molecules are too large b) when the molecules are insoluble c) when the direction of movement is opposite to natural diffusion c) none of the above

Sagot :

Facilitated diffusion is necessary when B. the molecules are insoluble. Insoluble molecules need help to diffuse across membrane, this is also called passive transport. 

Answer:

the molecules are insoluble

Explanation: