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所有生物都有必需的生命迹象，MRS GREN是七个生物必须运动的简称 分别是： M Movement All living things move,even plants. R Respiration. Getting energy from food. S Sensitivity. Detecting changes in the surroundings. G Growth. All living things grow. R Reproduction Making living things of the same type. E Excretion Getting rid of waste. N Nutrition. Taking in and use food.
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