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The sense organs adapt
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2.1. The sense organs The sense organs receive stimuli from the environment. They are usually found close to the surface at the front of the body. An animal's sense organs determine how it perceives…
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Matter is recycled and energy is lost in ecosystems
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When living things die, decomposers use the organic material to obtain energy. In doing this, they turn the organic biomolecules into inorganic material again. The action of decomposers closes the cycle…
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Think about it. Trophic relationships in ecosystems
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Remember what you have studied in this section and answer the questions: Are feeding relationships intraspecific or interspecific? Explain your answer. Why can there only be four or five trophic levels?…
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Learn. Risks from volcanoes - Energy inside the Earth
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Volcanic eruptions can cause loss of human life and material damage. This can be because of the material ejected from the volcano or as a consequence of the seismic activity which usually accompanies…
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Internal geodynamics and surface relief
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The forces inside the Earth cause mountain chains to form They also deform rocks and form folds, or break rocks and cause geological faults or joints. 6.1. Mountain ranges Mountain ranges are chains of…
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Calculate. Matter and its properties (2)
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Calculate the mass of water produced when 20 g of hydrogen reacts completely with 160 g of oxygen. g of water.
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Define. Concepts
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Define these words: Oscillatory motion Transverse wave Penumbra Refraction of light Primary colours of light Source of sound Echo
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Praise of the merchant class
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In France, a nobleman is far superior to a tradesman. I do not know, however, who is more helpful to the State: the finely dressed gentleman who knows at precisely what hour the king rises, and has airs…
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Interpret. Allegory of the stratified society
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Which social classes are represented in this image? What does it say about the social classes?
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Interpret. Population of Europe
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Describe the population growth in each country for each period: → grew from... to.../ grew more than... /The greatest growth took place in...
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