The following books and websites contain additional information, activities, and enrichment options.


Cells and Systems
Holly Wallace, Heinemann, 2003
The Diversity of Life: From Single Cells to Multicellular Organisms
Robert Snedden, Heinemann, 2002
The World of the Cell: Life on a Small Scale
Robert Snedden, Heinemann, 2002
Holly Wallace, Heinemann, 2000
Plant Classification
Louise and Richard Spilsbury, Heinemann, 2003
Classifying Mammals
Andrew Solway, Heinemann, 2003


The Electronic Naturalist
North American Mammals

For additional websites, see the Best of the Net feature at and sites recommended by the National Science Teachers Association at