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True / False. Urban growth
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Are these sentences true or false? The cities grew quickly because of the arrival of migrants from Africa. In the cities, many medieval walls were knocked down to build new neighbourhoods. The…
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Self-assessment T8 05 - Nutrition, breathing and circulation
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Are these sentences true or false? Our body exchanges oxygen for carbon dioxide inside the pulmonary alveoli. Cellular respiration takes place in the lungs. Cellular respiration takes place in the…
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Answer. Skeleton and muscles
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Answer the following questions: What are the functions of our skeleton? What is a joint? How many different types are there? What is a ligament? What is its function? Where do we have cartilage in our…
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Complete. Triangular structures
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Complete this text with the correct words: A triangular structure consists of a network of joined to form . The structure used in diagram 1 is . It is much more stable than the structure used in diagram…
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Self-assessment T10 03 - Machines and structures
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Match the definitions to the terms: A machine that converts another type of energy into electrical energy. A generator which uses magnetism to change kinetic energy into electrical energy. A machine…
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Investigate. Computer virus
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Have you ever heard of a "computer virus" or seen an "infected" computer? Computer viruses are small programs that are installed on our computer without our knowledge. Some can be very…
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Metalúrxicos, artesáns e comerciantes
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A metalurxia A finais da Prehistoria, o ser humano aprendeu a utilizar un novo material para fabricar obxectos: o metal. Por iso, a derradeira etapa da Prehistoria coñécese como Idade dos Metais. O…
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Autoavaliación T5 06 - Os primeiros poboadores
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Sinala as especies vexetais e animais segundo fosen domesticadas a inicios do Neolítico ou máis adiante: cabalo cabra maceira trigo porco coello can lentellas pataca
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Exemplos de moluscos
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Gasterópodos Os caracois teñen a cuncha en forma de espiral. As lapas, pola contra, teñen a cuncha cónica. Bivalvos Algúns bivalvos, como as ameixas, viven medio soterrados no fondo. Outros, como…
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Os vexetais e a súa clasificación
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Características das plantas As principais características das plantas, ou vexetais, son as seguintes: Non se alimentan doutros organismos, como fan os animais, senón que fabrican o seu propio…
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