A selectively-permeable biological membrane that separates the interior of all cells from the outside environment.

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Are cells really the basic unit of all life? [closed]

Please see comments as to the appropriateness of this question on biology SE. All known life on Earth is made up of cells. It is thus safe to say that all known life is characterized by the presence ...
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What specific membrane adaptations do cells have for saline-rich environs?

Are the cells of marine animals and flora equipped with special ion exchange pumps to mitigate the effects of a saline-rich environment? Or have the cell's membranes adapted through structural ...