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Think about it. The removal of cell waste
EduBook Organización
- 2095 visitas
Remember what you have studied in this section and answer the questions: Why do sponges and coelenterates not need excretory organs? What is the difference between defecation and excretion? Why is more…
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Work it out. Animal nutrition
EduBook Organización
- 2098 visitas
Remember what you have studied in this section and answer the questions: Is it possible to find a digestive system that does not use mechanical processes? And chemical processes? Explain your answer.…
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Investigate. The germination of pollen grains
EduBook Organización
- 2093 visitas
In this practical, you can see the germination process of pollen grains. Under normal conditions this takes place in the flower's stigma. Equipment A flower, a dropper, a microscope, a paintbrush, a…
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Learn. How to find out the age of a human foetus
EduBook Organización
- 2095 visitas
The approximate age of a foetus can be determined by scanning the mother's abdomen with an ultrasound machine. This method is usually used at a clinic to check that a pregnancy is progressing well…
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Analyse. Learn which part of the plant is sensitive to light
EduBook Organización
- 2096 visitas
An ecosystem is an area where certain living things live under certain environmental conditions. Therefore, there are many different ecosystems on Earth. Find an ecosystem close to your home or school,…
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Force and pressure
EduBook Organización
- 2095 visitas
6.1. The efficiency of force When a force is applied, the effect caused depends not only on the magnitude of the force, but also on the surface area to which it is applied. The relationship between…
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Talk about it. Obtaining and using energy
EduBook Organización
- 2096 visitas
Look at the pictures and answer the questions: Is the Sun a source of energy? And a bonfire? List five sources of energy. Which of them could run out? Will we always have oil to use? Name a source of…
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Summaries - Heat and temperature
EduBook Organización
- 2094 visitas
1. Energy transfer: heat Heat or thermal energy is the energy that is transferred from hot bodies to cold bodies. All the particles that make up bodies have internal energy; the particles in a hot body…
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Look. Nationalities of Europe in the 19th century
EduBook Organización
- 2105 visitas
Look at the map and answer the questions: Classify 19th century nationalities into their linguistic groupings. Make a four-column table using the information from the map. Why are the Russian, Austrian…
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The Napoleonic period (1799-1815)
EduBook Organización
- 2094 visitas
4.1. Napoleon: from consul to emperor In 1799 Napoleon was named consul, which saw the end of the Directory and the beginning of rule under the Consulate (1799-1804). This was a period of autocratic and…