CLASSIFICATION
5 Kingdoms webquest
The Kindgoms of Life (by Scholastic study jams)
Kid's corner on classification
Classification at pppst
BIOLOGY
Biology for kids
Cells for kids - this one has many many links to show various cells - a great one to look at
BrainPop on Cells
Kids Know it
Cells Alive
MICROSCOPES
KBears Virtual Microscope slides
University of Delaware Virtual Microscope
Discovery Education Virtual Slides
Microscopes at pppst
Biology Corner Microscope Quiz
National Research Council on Slides under a Microscope