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Check. The removal of cell waste
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Remember what you have studied in this section and answer the questions: Ask a classmate to define the key words. Which animals have excretory organs and which animals do not? Present your information…
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Think about it. Asexual reproduction in plants
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Remember what you have studied in this section and answer the questions: List the asexual reproduction organs we use for food. Can you and a classmate give other examples? What is the best method of…
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The natural environment
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1.1. The energy of the sun and life The ecosphere is a hypothetical zone existing around any star where the temperature allows life to exist. The conditions which make it possible for life to exist on…
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Unit 4: Animal reproduction
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Break off (v): to become separated from the main part of something. bud (n): a group of cells which differentiates and breaks off an animal to create a new individual by asexual reproduction. budding…
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The periodic table and chemical formulas
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5.1. The symbols of chemical elements Each one of the 118 known chemical elements has a name and is represented by a chemical symbol. These symbols consist of one or two letters (the first a capital…
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Think about it. Forms of energy
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Remember what you have studied in this section and answer the questions: Complete the sentences to explain how energy is converted: The electrical energy in a radiator is converted into... The…
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Learn. Some optical instruments - Waves. Light and sound
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Some optical instruments Most optical instruments, like microscopes or telescopes, consist of lenses, mirrors and prisms. Lenses Lenses are disc-shaped, and one or both sides are curved. They are made…
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Complete. The Napoleonic era
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Complete the following sentences about the Napoleonic period with the missing words: Napoleon was named in 1799, and he introduced an autocratic and regime. Napoleon wanted to establish a regime that…
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Match. Political groups in the French Revolution
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Match the political groups of the French Revolution with their main ideas: Supporters of the Ancien Régime. They believed in equality above all things. They wanted to reach agreement with the king to…
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Tendencias musicales en el siglo XX
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