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Proton pumps are used in various ways by members of every domain of organisms: Bacteria, Archaea, and Eukarya. What does this most probably mean?A) Proton pumps must have evolved before any living organisms were present on earthB) Proton gradients across a membrane were used by cells that were the common ancestor of all three domains of lifeC) The high concentration of protons in the ancient atmosphere must have necessitated a pump mechanismD) Cells of each domain evolved proton pumps independently when oceans became more acidicE) Proton pumps are necessary to all cell membranes
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