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As defensas do organismo: o sistema inmune
EduBook Organización
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5.1. O sistema inmune O sistema inmune é o responsable de que o noso organismo se defenda diante da invasión de xermes, órganos, células e moléculas estrañas, tamén denominadas antíxenos. Os…
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O solo: contaminación e degradación
EduBook Organización
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5.1. A contaminación do solo A contaminación do solo é un problema importante porque a maioría dos contaminantes que se atopan nel poden chegar á auga, así como ao aire e ás cadeas alimentarias.…
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Autoavaliación 10.2 - A actividad xeolóxica externa da terra
EduBook Organización
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Selecciona as afirmacións correctas respecto da intervención da atmosfera na filtración da radiación solar.
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O movemento do xeo nun glaciar
EduBook Organización
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A mediados do século XIX, o naturalista suízo Louis Agassiz demostrou, por primeira vez, como se movía o xeo nun glaciar dos Alpes. Agassiz colocou unha fileira de estacas a través da lingua do…
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Match. Elements of a medieval castle
EduBook Organización
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Match the definitions with the word: Opening that archers could shoot through. Iron grating that protected the main entrance. Two or three-storey building that was used as a residence for the feudal…
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Choose. The subsistence economy of peasants on a fiefdom
EduBook Organización
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Choose the correct answer: Which social group made up the majority of the population in the Middle Ages? How many categories of peasant were there? What type of agriculture was used during the Middle…
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Analyse. The Plaza Mayor in Madrid and in Salamanca
EduBook Organización
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Look at the image and answer the question: Look for an image of Salamanca's Plaza Mayor on the internet. What elements does it share with Madrid's main square?
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Interpret. Population inequality
EduBook Organización
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Look at the graph and do the activity: Look at the graph and use the data to comment on the following statement: The world's inhabitants are distributed unevenly across the planet.
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Complete. Countries according to their economies
EduBook Organización
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Complete these sentences with the missing words: In countries, the percentage of the active population in the primary sector is very . In developing , more than half of the active population works in…
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Efectúa mentalmente las siguientes operaciones:
EduBook Organización
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Efectúa mentalmente las siguientes operaciones: 7 × 4.000 = 4 × 900 = 8 × 8.000 = 7 × 70.000 = 6 × 50 = 5 × 30.000 = 2 × 5.000 = 4 × 2.000 = 5 × 8.000 = 3 × 600 = 6 × 6.000 = 9 × 500 =
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