Abiotic factors

2.1. How do abiotic factors affect living things? Abiotic factors determine the distribution, size and number of living things, and even their capacity to reproduce. The most influential abiotic factors…

End-of-unit evaluation - The natural environment. Ecosystems

Most of the energy used by living things originally comes from sunlight which is trapped by autotrophs (or producers). This energy is then transferred from the producers to all other living things…

Check. Test yourself

Remember what you have studied in this unit and answer the questions: What is the temperature of the matter at the Earth's core? How fast do tectonic plates move? How do two touching plates move in…

Calculate - End-of-unit activities

Calculate the work done by a person who pushes a wheelbarrow for a distance of 100 m if he exerts a force of 500 N. What is the efficiency of a machine which does 230 J of work but uses 410 J of total energy?

Analyse. The English political system

Look at the diagram and answer the questions: Using the diagram to help you, explain why England was not an absolute monarchy. What is the difference between the two Houses? Who elects the Commons? Is…

Summarise. The First World War and the Russian Revolution

Summarise the text. Write paragraph headings. At the beginning of the 20th century, economic rivalry between the nations and the colonies led to an increase in tension amongst the European states. An…

The renewed conflict between the blocs (1975-1985)

6.1. Soviet expansion Many countries without democratic traditions were attracted by the Soviet model. These countries either had serious economic and social problems or were former colonies that had…

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Autoevaluación (1) - Elementos básicos de geometría

¿Cuántas rectas determinan cuatro puntos tales que tres cualesquiera de ellos no están en línea recta? rectas.