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The six major food groups
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Foods are classified into six major food groups according to the nutrients they contain. It is important to have a balanced and healthy diet. Cereals such as wheat and rice, products made from cereals…
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Complete. The digestive glands
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Complete this text with the correct words: The digestive glands produce digestive and release them inside the alimentary . Some digestive glands are microscopic. They are found on the walls of the and…
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How the heart works
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The heart pumps blood into the arteries when its muscular walls contract. Each cycle of contractions is called a heartbeat. Young people have between 70 and 90 heartbeats a minute. When the heart…
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Answer. Blood circulation
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What does the heart do? Name the two stages of the heart's circulation. Why is it called a double closed circuit?
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Experiment. Stable and resistant structures
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It is important to use the right material to make pillars and beams more resistant. It is also important to consider their geometric shape and position. Do this experiment to check the resistance of an…
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Sound and noise
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What is sound? Sound is produced by vibrating objects. We perceive sound because we use our sense of hearing. When an object produces a sound, it travels through the air or other objects (walls,…
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Answer. Sound and noise
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How is sound produced? Name the three properties of sound. What is an echo? What is noise pollution?
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Interpreta. Lonxitudes dos ríos
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Observa o debuxo e responde: Cales son os dous ríos galegos que contan cunha maior lonxitude? Indica os quilómetros que percorren. Que ríos teñen todo o seu percorrido por Galicia? E cales só…
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Avaliación final T6 06 - No tempo dos romanos
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Escribe a función de cada unha das seguintes edificacións romanas: teatro, acueduto, templo, foro, anfiteatro e arco de triunfo.
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Avaliación final T09 04 - Os seres vivos
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Responde as preguntas: Como se denomina cada un dos cambios do ambiente aos que é sensible un ser vivo? En que consiste o crecemento dun organismo? Mediante que proceso obteñen a enerxía os seres vivos?
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