A nice site which provides descriptions of each of the bones that make up our skeletal system. Then there is a lab activity for students to complete in which they build a skeletal system and describe the structure/function of each bone...

A slide-show presentation illustrating the differences between eukaryotic and prokaryotic cells.

This lesson explains the difference between Eukaryotic and Prokaryotic cells. It is 3 of 4 in the series titled "Eukaryotic vs. Prokaryotic Cells."