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The total quantity or weight of organisms in a given area or volume |
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The strength and vitality required for sustained physical or mental activity |
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a device that produces a continuous electric directly from the oxidation of a fuel, as that of hydrogen |
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Of, relating to, or produced by the internal heat of the earth |
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of or relating to the nucleus of an atom |
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The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects |
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The ability to do something or act in a particular way, esp. as a faculty or quality |
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