quote:Originally posted by expressionless:
Seven criteria for “life” (apologies for the basic GSCE biology level of my knowledge): movement,nutrition, respiration, excretion, growth, reproduction, and sensitivity to stimuli.
I would disagree with respiration, excretion, growth, and reproduction as necessary for life. Certainly movement is necessary (although I would use the word change), and sensitivity to stimuli is necessary, but if we imagined a being in every way like a human, but who didn't breath, grow, excrete or reproduce, would we really feel like this person wasn't a life form? I will agree that nutrition is probably necessary, since I don't see any other way a being can move about and respond to stimuli without it. But I would argue that, although life probably can't exist without nutrition, this characteristic doesn't seem to beling in the definition, since we can conceieve of a being that doesn't require nutrition. |