Cells

http://www.ducksters.com/science/the_cell.php

http://www.sheppardsoftware.com/health/anatomy/cell/index.htm

http://www.classzone.com/books/ml_science_share/vis_sim/chm05_pg7_cell/chm05_pg7_cell.html

http://waynesword.palomar.edu/lmexer1a.htm

http://www.kidskonnect.com/subjectindex/15-educational/science/396-cells.html

http://www.kidinfo.com/health/human_body.html

Microorganisms:  http://www.biology4kids.com/files/micro_main.html