Presents an overview of a long-term unit centering on observations of biological change. Explains the purpose, procedures, and activities of long-term projects as: watching a plot of land; seeing how a baby grows, and witnessing kitten birth and growth. Suggests additional activities which address the concept of continuity. (ML)

Provides suggestions for activities that focus on earthworms. Includes observational exercises on earthworms' reactions to light and touch. (ML)

Describes some of the characteristics of the common harvestmen, or daddy longlegs, and the true spider. Provides information on harvestmen's habitats and life cycles and includes tips on housing and observing these organisms in science classrooms. (TW)

Presents activities that utilize nature hikes to develop students' understanding of environment-related issues, observation skills, and critical thinking skills. Activities include alphabetizing observed objects, identifying objects by smell, observing ants, and a scavenger hunt. (MDH)