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Exemples de mol·luscs
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Gasteròpodes Els cargols tenen la closca en forma d'espiral. Les lapes, en canvi, tenen la closca cònica. Bivalves Alguns bivalves, com les cloïsses, viuen semienterrats al fons. Altres, com…
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Diversos tipus de corol·la
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Els pètals d'una flor solen ser tots iguals, com en la rosa silvestre. Hi ha flors amb pètals que tenen formes o mides diferents, com en la mongeta. En la tulipa, els pètals no es diferencien…
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Centrals elèctriques que utilitzen energia calorífica
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Les centrals elèctriques són els llocs on es produeix l'energia elèctrica que es fa servir als habitatges, en la indústria i el comerç, en el transport ferroviari, etc. Hi ha dues classes de…
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Answer. The Iberian Peninsula
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Answer the following questions: In which continent is the Iberian Peninsula? Which seas and oceans surround the Iberian Peninsula? Which mountains are to the north of the Peninsula?
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Complete. Tissues
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Complete the following text about tissues with the correct words: cells tissues organs different muscle function There are many types of cells in a multicellular organism and they are grouped in…
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Answer. Amphibians and reptiles
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Remember what you have studied in this section and answer the questions: Where do amphibians live? Why is the skin of amphibians moist and slimy? How do reptiles move from place to place?
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Think. The respiration in fish.
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This diagram shows the process of respiration in fish. Look at the diagram and explain the process in your notebook.
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Classify. Groups of arthropods
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Which group of arthropods... ... have four pairs of legs? ➝ ... have three pairs of legs, and wings? ➝ ... have five pairs of legs and live in the sea? ➝ ... have lots of legs and live on land? ➝
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Interpret. Classifications
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This graph shows the proportion of species in each group of animals. Look at the graph and answer the questions: Which animal group has the most species? Which has the least? Are there more species of…
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True/false. Kinetic energy
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Decide if the following statements are true or false: Heat energy acts on objects using forces. ➝ Forces can produce movements and deformations. ➝ Ice cream will melt because of kinetic energy. ➝…
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