This course was written by Lindsay Hewitt, Sarah Burton and Julie Robson.
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Figure 3.1: Flynt/Dreamstime
Figure 3.2: photo by Ross Finnie for © The Open University
Figure 3.3: photo by Moira Dunworth for © The Open University
Figure 3.4: © The Open University/Library image (model image only)
Figure 3.5: photo by Ross Finnie for © The Open University
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