Una razón es que disminuye la presión del aire. Al respirar, intercambiamos desperdicios por materiales ú t i l e s que están en el ambiente. ¿Qué material útil entra al cuerpo cuando respiramos? ¿Qué desperdicios liberamos? ¿Cómo crees que pueden sobrevivir las personas que viven en las alturas?
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Una razón es que disminuye la presión del aire. Al respirar, intercambiamos desperdicios por materia...
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