1. http://www.gdckillam.com/Photos/03_29_2008_30_26protozoa.pdf 2. http://www.gdckillam.com/Photos/03_29_2008_36_36invertebrate%20clf.docx 3. http://www.gdckillam.com/Photos/03_29_2008_40_40vertebrate%20classification%20(1).pdf