Useful Links:
5th Grade Science
digestive system:
http://kidshealth.org/PageManager.jsp?lic=1&article_set=59299&cat_id=20607
respiratory system:
http://science.nationalgeographic.com/science/health-and-human-body/human-body/lungs-article.html
http://kidshealth.org/PageManager.jsp?lic=1&article_set=59300&cat_id=20607
6th Grade Science
Mitosis:
http://www.youtube.com/watch?v=VlN7K1-9QB0&feature=related
Protozoans (pictures):
amoeba:
http://leavingbio.net/Amoeba/Amoeba.htm
7th Grade Science
chemical compounds in cells:
http://ibiblio.org/virtualcell/textbook/chapter2/chapter2.htm
Virtual Microscope:
http://www.udel.edu/biology/ketcham/microscope/scope.html
Name that Cell
http://school.discoveryeducation.com/lessonplans/activities/electronmicroscope/#