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Think about it. Trophic relationships in ecosystems
EduBook Organización
- 2442 visitas
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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Non-governmental organisations: Action Aid
Maria Pallarés Docente
- 1 lo usan
- 2517 visitas
Action Aid webpage. The primary aim of Action Aid is to fight poverty worldwide. This NGO helps people fight for the right to eat, the right to stay on their land, to an education or to have a say in…
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Spermatophytes (flowering plants)
EduBook Organización
- 2384 visitas
Characteristics of spermatophytes Spermatophytes reproduce through flowers. They are the most numerous of all the plant groups and include trees, grasses and cultivated plants. Spermatophytes are…
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Before you start - The Atmosphere
EduBook Organización
- 2361 visitas
Didactic objectives Locate and describe the different parts of the atmosphere. Identify the gases that make up the air, their properties and uses. Know about primary and secondary pollutants and how…
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Important materials
EduBook Organización
- 2344 visitas
There are many materials that are very important and useful. 6.1. Metals Metals are common materials that are extracted from minerals. They are used to conduct electricity, build buildings and make…
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Look. Forest ecosystems
EduBook Organización
- 2333 visitas
Most of the primary forests on the planet, those which have not been altered by human activity, are the northern boreal forests and the tropical jungles. However, according to the FAO (UN Food and…
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Tertiary sector activities
EduBook Organización
- 2261 visitas
1.1. What is the tertiary sector? The tertiary sector, or service sector, does not produce material goods like the primary and secondary sectors. It is made up of services. This sector is the most…
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Match. Principles of enlightenment thought
EduBook Organización
- 2069 visitas
Match each statement with the correct concept: Agriculture is the primary source of a country's wealth. Absolutism must be taken to the next stage and reformed by distributing power. State…
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Find out about...
EduBook Organización
- 2051 visitas
Different types of economic activity The economic development of a country is a reflection of its economic activity. Economic activity is made up of three sectors: the primary sector (agriculture,…
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O9 Library of Congress American Memory SM
Francisco Cerrillo Docente
- 1 lo usan
- 730 visitas
The home page for the American Memory Historical Collections from the Library of Congress. American Memory provides free access to historical images, maps, sound recordings, and motion pictures that…
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