All life forms currently have a basic cell membrane so we presume that the earliest forms of life had this "fence" isolating the internal organization from the external chaos.It is likely that the primordial environment was acidic.In such a case,the cell membrane would have to include

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Since the primordial environment was acidic, the cell membrane would require a proton (H⁺) pump to actively transport protons out of the cell and maintain a proper pH balance. The other options are not necessary for the basic function of a cell membrane. A sodium pump is more commonly found in organisms living in a sodium-rich environment, mitochondria are believed to have evolved from independent bacteria and are not necessary for basic cellular function, an acid-proof cell wall would be redundant given the presence of a cell membrane, and a nonpermeable membrane would prevent necessary substances like nutrients and waste products from entering and leaving the cell.

All Life Forms Currently Have a Basic Cell Membrane So