This free course was written by Liz Smith. It was first published in December 2018.
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The material acknowledged below is Proprietary and used under licence (not subject to Creative Commons Licence). Grateful acknowledgement is made to the following sources for permission to reproduce material in this free course:
Figure 1: © Sandsun/Getty Images
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Figure 5: © Jirsak/Getty Images
3 The Grow Model: © Michael Heath
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