9 Acknowledgements
Grateful acknowledgement is made to the following sources:
Figure 1: © Sergey Nivens/123RF.com [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)]
Figure 2: © Sergey Khakimullin | Dreamstime.com
Table 1: Internet Explorer, Apple Safari, Mozilla Firefox, Chrome, Edge and Opera
Figure 5: Andrew Smith This file is licensed under the Creative Commons Attribution Licence http://creativecommons.org/ licenses/ by/ 4.0/
Figure 6: Andrew Smith This file is licensed under the Creative Commons Attribution Licence http://creativecommons.org/ licenses/ by/ 4.0/
Figure 7: Andrew Smith This file is licensed under the Creative Commons Attribution Licence http://creativecommons.org/ licenses/ by/ 4.0/
Figure 8: Andrew Smith This file is licensed under the Creative Commons Attribution Licence http://creativecommons.org/ licenses/ by/ 4.0/
Figure 9: Andrew Smith This file is licensed under the Creative Commons Attribution Licence http://creativecommons.org/ licenses/ by/ 4.0/
Every effort has been made to contact copyright holders. If any have been inadvertently overlooked the publishers will be pleased to make the necessary arrangements at the first opportunity.
8 End of course quiz