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Feeding and digestion in animals
EduBook Organización
- 3530 visitas
1.1. How do animals feed? Animals are heterotrophic; they need to find food and transform it to get nutrients. These substances provide energy and materials the animal needs to grow, make new tissues…
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Summaries - Energy
EduBook Organización
- 3391 visitas
1. Energy Energy is the power that causes change in things and allows us to carry out work. Energy is produced by energy sources. The main source of energy on Earth is the Sun. Energy exists in several…
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End-of-unit activities - Matter and materials
EduBook Organización
- 3309 visitas
Everything around us is made up of matter. Matter can be found in three states: solid, liquid and gas. The air we breathe is a gas, the water in rivers and seas is a liquid, and the rocks are in a solid…
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Introduction - Matter and materials
EduBook Organización
- 3229 visitas
Everything around us is made up of matter. Matter can be found in three states: solid, liquid and gas. The air we breathe is a gas, the water in rivers and seas is a liquid, and the rocks are in a solid…
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Rock types
EduBook Organización
- 3105 visitas
Sedimentary rocks Common salt is made when sea water evaporates. It is extracted from salt mines. Sandstone is a sedimentary rock made up of grains of sand that are held together by other mineral…
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Initial evaluation 2 - The Hydrosphere
EduBook Organización
- 2813 visitas
Complete the text with the missing words: Seawater is mainly made up of water and chloride. The water in rivers contains substances compared with the water in seas and oceans. At the poles and in…
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End-of-unit evaluation - Matter and materials
EduBook Organización
- 2700 visitas
Everything around us is made up of matter. Matter can be found in three states: solid, liquid and gas. The air we breathe is a gas, the water in rivers and seas is a liquid, and the rocks are in a solid…
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Final Autoevaluation 1.01 - Plant nutrition
EduBook Organización
- 2373 visitas
J. van Helmont's experiment Van Helmont (1577-1644), a Flemish doctor and chemist, thought that in addition to water, air and substances in soil, other elements must be necessary for plant…
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The propagation of heat
EduBook Organización
- 2356 visitas
Heat transfers from a hot object to a cold object by means of three mechanisms: conduction, convection and radiation. 6.1. Conduction Heat is transmitted through solid substances by conduction (figure…
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