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In this activity, learners plant seeds and watch them sprout and grow inside a CD case.

This lesson introduces learners to the world of nematodes (roundworms).

In this activity, learners create a freshwater ecosystem in a large plastic bottle. Learners cut and prepare bottles, then fill with water, aquatic plants, snails and fish.

In this activity, learners make a miniature greenhouse or "terrarium" to explore the greenhouse effect.

In this activity, learners build a model of a self-sustaining habitat (growing grass and beans from seeds).

In this two-part activity, learners compare and contrast a variety of life cycles to better understand different organisms and how they develop.

In this activity (located at the bottom of the page), learners investigate soil and explore the creatures that live in it.

Using zebra mussels (Dreissena polymorpha), elodea and an indicator dye, learners study the role of light in photosynthesis.

Did you know that the water we use today is the same water found on Earth millions of years ago? The Earth constantly uses and recycles water in a process called the water cycle.

In this activity about daily rhythms (on page 17 of the PDF), learners will explore circadian patterns in humans, animals and plants.

This detailed lesson plan for a field trip to Canyonlands National Park in Utah (page 32 of pdf) teaches students about the habitat of bighorn sheep.