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Why do boats float?
EduBook Organización
- 3116 visitas
If we make a little boat out of a walnut shell, we see that it floats and we relate this to the fact that the walnut shell is less dense than water. But what about real boats? Some of them are huge,…
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Interaction in animals
EduBook Organización
- 3126 visitas
1.1. What is interaction? Interaction is a function that allows living things to perceive information from the outside or from inside the organism and respond to changes that take place. 1.2. Stimulus…
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Analyse. Study the law of the lever
EduBook Organización
- 3123 visitas
A lever is a simple machine consisting of a bar which pivots on a turning point or fulcrum. Using a lever and applying a force (F) to the longest arm (the part of the bar from the fulcrum to where the…
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Let's learn how to... - Work
EduBook Organización
- 3094 visitas
Do a survey A survey is a way of collecting information, or data. To do a survey, we use a questionnaire. This is a list of questions that ask for specific information. When you do a survey you should…
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Complete. The tertiary sector
EduBook Organización
- 3079 visitas
Complete the following sentences with the missing words: activities – diversity – information – tertiary – social – services – quaternary – lower-end – upper-end The sector includes…
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Did you know... Walmart
EduBook Organización
- 3071 visitas
Walmart is the largest company in the world. It is a chain of hypermarkets that employed 2.1 million people in 2011. It offers products at very low prices, but its workers earn low wages. Millions of…
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Self-assessment T10 02 - Machines and structures
EduBook Organización
- 3081 visitas
Complete these sentences with the correct words: Some objects become electrically when we rub one against the other. Electrical current is the flow of through materials. A is needed to create the…
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Light, shadow and penumbra
EduBook Organización
- 3074 visitas
3.1. Linear propagation of light Light is an electromagnetic wave that propagates in a straight line in all directions. Each of the directions that light propagates in is called a ray. This phenomenon…
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Think. Respect for ecosystems
EduBook Organización
- 3058 visitas
The main objective of nature conservation is to protect living beings in their natural habitats and, to do this, it is necessary to understand and respect the relationships that exist between living…
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