Small Stuff Moves Through

a: Semi permeable membrane ~
b: chain linked fence

What: Semi permeable membrane is like chain linked fence. You want big molecules or big stuff to stopped cause while small stuff moves through. A fence acts like this, the bees can move through the fence while dogs, even very small dogs are trapped on one side.

Writer: Lucretia
Where: Reference Link Has Evaporated
Date: May 13 2013 12:07 PM

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