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Revolution of the Earth: seasons of the year
EduBook Organización
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4.1. Revolution of the earth The movement of the Earth around the Sun is called a revolution. The Earth takes about one year to complete a revolution of the Sun. The exact time is 365 days, 6 hours and…
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Arthropods (I): characteristics
EduBook Organización
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4.1. Arthropods Arthropods are the most numerous and diverse group of invertebrates. They have adapted to all kinds of environments. The body of an arthropod has three parts: the head, thorax and…
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Health
EduBook Organización
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Health and illness We say we are in good health when our body works well and we are not ill. Sometimes we get ill. When we are ill, we have symptoms, like a fever, headache or stomach pains. We say that…
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Check. Women and the French Revolution
EduBook Organización
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Remember what you have studied in this section and answer the questions: Which social reforms introduced during the Revolution benefited women? Make a list of the social classes and professions of the…
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David's house
EduBook Organización
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Houses did not have electricity Clara's great-grandfather lived in a village when he was young. Great-grandfather David's house did not have electricity. People used oil lamps or candles to…
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Calculate. Force and pressure
EduBook Organización
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Remember what you have studied in this section and answer the questions: What pressure is exerted on the ground by a person with a mass of 80 kg wearing skis with a total surface area of 0.6 m2? We have…
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Answer. Worms and molluscs
EduBook Organización
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Remember what you have studied in this section and answer the questions: What do worms look like? What protects a mollusc's body? What three groups are molluscs classified into? Some worms live in…
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Video game: Control of the Cell Cycle
Tiching explorer Organización
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In this game we are "Cell division supervisors", inside the cell nucleus, which means we have to steer the mitosis to make sure everything happens in the right order. In the introduction we…
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Introduction - The Population of Spain
EduBook Organización
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Spain is not densely populated compared to other European countries. However, in the 20th century the population began to grow. The major changes in Spain's population in recent decades have been…
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True/false. Mosses and ferns
EduBook Organización
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Are the following sentences true or false? The difference between mosses and ferns is that the former cannot do photosynthesis. Mosses and ferns are both non-vascular plants. Mosses and ferns are both…
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