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85.- ¿Cuál de las siguientes opciones completa la siguiente oración?El sostenimiento de la vida sobre la tierra y renovación, contribuyendo a conservar los ecosistemas, permitiendo su autorregulación y el reciclaje de sus propios desechos, proveyéndole de bienes que ayudan a la humanidad de manera insustituible, se logra debido a: _____

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