Utah Education Network
Uen: Cell Structures Wee Beasties
In this activity you observe photographs of cells and then make comparisons of the animal and plant cells.
Biology 4 kids
Biology4 Kids: Cell Structure
Informational, illustrated site covers the basics of cell structures and various cell types.
CK-12 Foundation
Ck 12: Biology: Animals: Overview Study Guide
This comprehensive study guide covers the main terms and concepts needed for a biology unit on animals.