Tesst help!

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter26/animation__organs_of_digestion.html

http://kitses.com/animation/swfs/digestion.swf

http://www.vtaide.com/png/digestiveF.htm

http://urbanext.illinois.edu/worms/anatomy/index.html

http://www.naturewatch.ca/english/wormwatch/virtual_worm/index.html