Classification Quiz: http://go.hrw.com/activities/frameset.html?main=2270.html
6 Kingdoms: http://www.cstephenmurray.com/onlinequizes/biology/Taxonomy/sixkingdoms1.htm
http://www.ric.edu/faculty/ptiskus/six_kingdoms/index.htm
Dichotomous Keys: http://www.biologycorner.com/worksheets/pamishan.html
http://dnr.wi.gov/org/caer/ce/eek/veg/treekey/index.htm
