Of course these minimum life requirements don't fully address what it means to be alive. For even beyond all the metabolic processes, there was also … - Jon Stewart

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Of course these minimum life requirements don't fully address what it means to be alive. For even beyond all the metabolic processes, there was also an intangible essence separating the living from the not. Call it a soul, or just a need we had. Every living thing possessed a certain energy or life-force that infused even the unicellular among us.