References

1.http://www.nau.edu/~cline/speccoll/kids/kids2.html

2.http://www.ex.ac.uk/~gjlramel/images/odonata/thumbs/od-thumbs1.html

3.http://dekalb.dc.peachnet.edu/~jaliff/water.htm

4.http://www.doe.ca/water/en/nature/aquale_ecosys.htm

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