I am taking Introductory Human physiology course on Coursera. The teacher said and I quote " the membrane of the cell is a hydrophobic barrier that prevents any charged ions or molecules from moving from extracellular environment to the interior of the cell." But why nature came up with a hydrophobic barrier i.e. plasma membrane since most of the ions/molecules that are present in extracellular environment and needed by the cell are polar/charged?

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    $\begingroup$ Can you take a guess on what was the most common solvent when earth began to take shape? $\endgroup$ – WYSIWYG May 27 at 11:59
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    $\begingroup$ @WYSIWYG I m betting on Water. $\endgroup$ – Beyond Zero Jun 4 at 3:26
  • $\begingroup$ So.. you have your answer $\endgroup$ – WYSIWYG Jun 4 at 7:20

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