Lessons are intended for use in any high school biology course; however, many can be used in middle school/junior high school life science and earth science classes, possibly with slight modification depending on teacher's style and approach and the experience and level of students. Many would likewise be appropriate for use in junior college or lower division university levels.

The lessons fall into four major areas:

• NATURE OF SCIENCE
• EVOLUTION
• ORIGIN OF LIFE
• GENETICS, DNA, and OTHER BIOLOGY LESSONS

Within each area, the lessons have been placed into specific topic categories, based on the focus topics of the ENSI program. Some lessons could fit into two or more topics, and this is usually indicated in those lessons, often with appropriate cross-links.

Explore the archived ENSIWEB site for general information about the lessons, teaching units and tips, and lesson topics.