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Did you know?...Coevolution
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Coevolution is the process of evolution where some plants and animals evolve in a way that affects another organism. Some animals have developed a part of their body to help them drink nectar from…
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The life cycles of animals
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Remember what you have studied in this section and answer the questions: Ask a classmate to define the following words and expressions: life cycle, metamorphosis, moulting, chrysalis, tadpole. Correct…
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Did you know?
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The mass of an object does not change when you move it from one place to another or take it to the Moon. But weight does vary, because the magnitude of gravity on Earth is not constant at 9.8 m/s2…
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Calculate. Forces and work
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¿What is the efficiency (expressed as a percentage) of a machine that performs work of 1190 J and 1400 J for it consumption? η = %
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Choose. The history of energy
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Choose the correct answer: What was the first source of energy for humans? Which machine ushered in the industrial revolution? What is the most important source of energy for the Earth, and not just for…
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Check. Materials that conduct and insulate heat
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Remember what you have studied in this section and answer the questions: What are the three ways by which heat is propagated? Give one example of each. Does matter move in convection? And in radiation?…
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18th century Spain: the Bourbon monarchy
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6.1. The War of Succession (1701- 1714) The last king of the House of Austria, Charles II, died childless. Shortly before his death, he appointed his great-nephew, the French Prince Philip of Bourbon,…
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Research. The Luncheon on the Grass
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Why do you think that this painting caused such controversy at the time it was painted?
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The Nazi programme
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We demand that all Germans should be united to create a Greater Germany (...). We demand (…) the abolition of the treaties of Versailles and Saint-Germain. We demand lands and colonies to feed our…
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Interpret. The path towards war
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Look at the map and answer the questions: Use the map to explain Italy and Germany's aggressive foreign policy and mutual assistance pacts. ➞ Which areas did ... annex? Was ... an ally of ...? Why…
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