Credits and Acknowledgement

Credits:

Photographer: Pok Shun
Part A : Danish
Part B&D : Pok Shun
Part C&F : Jing Yi and Eileen


Acknowledgement:


http://www.wikipedia.org/
http://www.google.com.sg/
http://www.hobart.k12.in.us/jkousen/Biology/impact.html
http://www.newagepublishers.com/samplechapter/000262.pdf
http://www.egyankosh.ac.in/bitstream/123456789/36528/1/Unit-6.pdf
http://library.thinkquest.org/C007231/intro.htm
http://www.tutorvista.com/content/science/science-ii/environment/activities-environment.php#
http://greenliving.nationalgeographic.com/pollution-affect-living-things-including-humans-2193.html
http://www.nparks.gov.sg/