Related links to the lessons:

1. Insects that fly
   • Yuckiest Worm World
   • The University of Florida, Book of Insect Records 1999
     
     
2. Characteristics of living things
   • Interactive Eye [cell division]
   • Reed College, Biology Department [gastrulation]
   • cells alive!
     
     
3. Others
   • Library of Congress
   • UK universities
   • Institute for Scientific Information (ISI^®)
   • BIOSIS Free resources
   • Animal Diversity Web
   • Scientific American magazine