Contents
Humans and animals
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1.1 Body organs 1.2 The heart 1.3 Heartbeat and pulse 1.4 The lungs and breathing 1.5 The digestive system 1.6 What do the kidneys do? 1.7 What does the brain do? Check your progress
Living things in the environment
2.1 Food chains in a local habitat 2.2 Food chains begin with plants 2.3 Consumers in food chains 2.4 Food chains in different habitats 2.5 Deforestation 2.6 Air pollution 2.7 Acid rain 2.8 Recycling 2.9 Take care of your environment Check your progress
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Introduction
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Material changes
3.1 Reversible and irreversible changes 3.2 Mixing and separating solids 3.3 Soluble and insoluble substances 3.4 Separating insoluble substances 3.5 Solutions 3.6 How can we make solids dissolve faster? 3.7 How does grain size affect dissolving? Check your progress
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Contents
9781107699809pre.indd 4
14/11/2013 10:15