Soft Schools
Soft Schools: Classification of Organisms Quiz
Take an interactive quiz over the classification of living things. After completing the quiz, check your score, and then revisit any incorrect question for further review.
Other
Pennsylvania Doe: Lesson Plan: Biological Levels of Organization
A lesson plan that takes students through the process of organizing a set of biological picture cards according to levels of complexity.
Other
Monroe County Public Library: How to Use the Dewey Decimal System
An overview of the Dewey Decimal System, with a list of the categories.