Fraser , Doug , Barry LeDrew, Jim Axford, Allan Carmichael, John Munro, Karen Morley, and Darrel Scodellaro . “Sustainability of Ecosystems.” Science Probe 10. Scarborough, ON: Nelson Education Ltd., 2008. 491-541. Print.
LeDrew, Barry , Doug Fraser , Jim Axford, Allan Carmichael, John Munro, Karen Morley, Darrel Scodellaro, and Barb Mckinley. “ Sustainability of Ecosystems.” B.C. Science Probe 10 Teachers Resource. Toronto: Nelson Education, 2009. 518-564. Print.
LeDrew, Barry , Doug Fraser , Jim Axford, Allan Carmichael, John Munro, Karen Morley, Darrel Scodellaro, and Barb Mckinley. “
Sustainability of Ecosystems.” B.C. Science Probe 10 Teachers Resource. Toronto: Nelson Education, 2009. 518-564. Print.
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