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| environmental factor (In environmental science, an environmental factor or ecological factor or ecofactor is any factor, whether abiotic or biotic, that influences living organisms (abiotic factors include ambient temperature, amount of sunlight, and pH of the water soil in which an organism lives, while biotic factors include the availability of food organisms and the presence of conspecifics, competitors, predators, and parasites). WK Alexander Demidov) | |||