yolosanti45
yolosanti45 yolosanti45
  • 09-06-2016
  • Biology
contestada

que es la contaminacion del aire

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vadimbur
vadimbur vadimbur
  • 09-06-2016
la presencia o introducción en el aire de una sustancia que tiene efectos nocivos o tóxicos.
the presence in or introduction into the air of a substance which has harmful or poisonous effects.

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