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La contaminación

la contaminación es la alteración del estado natural de un medio debido a la introducción en él de un agente que no pertenece a él o que sí que pertenece pero en proporciones mucho menores.
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lengua tecnologías de la información y comunicación 1º bachillerato tecnologias Recommended age: 16 years old
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aneli vergara
aneli vergara
Spain

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