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Humans can manipulate their environment, and adapt to many different conditions, far more than an amoeba.

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This in no way applies worth. Furthermore, we manipulate our environment to the detriment of ourselves and everything else on this planet(global warming). This is an argument for a human having less worth than an amoeba.

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Also a human has many more cells than an amoeba. Further, a human has a greater lifespan than an amoeba.

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A giant sea tortoise has more cells and a longer lifespan than a human. Is it thus a more valuable creature than humans?

Come on now, surely someone can give it a better try than this.