Why the need for more than one mechanism

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Diffusion may occur via simple movement across the membrane or via carrier proteins. Furthermore, various types of carrier proteins may be involved. Why the need for more than one mechanism?

Reference no: EM13991067

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Why the need for more than one mechanism : Diffusion may occur via simple movement across the membrane or via carrier proteins. Furthermore, various types of carrier proteins may be involved. Why the need for more than one mechanism?

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