Students first consider what supports all life on Earth
and are then introduced to the levels of environmental
organization (biosphere, biome, ecosystem, community,
population, and organism).

Students take a short field trip into the schoolyard for a scavenger hunt to find examples of nonliving (abiotic) and living (biotic) ecosystem components, including organisms, habitat, population, community, ecosystem, sunlight, water, temperature, nutrients, and wind. This activity can be used as an informal assessment for Lesson 1.

 LESSON 2: A MUCKY MYSTERY: A NUTRIENT ENRICHMENT CASE STUDY Students complete a reading about three teens who visit the Saginaw Bay to go swimming and encounter decaying vegetative muck washed up along the shoreline. Students interact with a mystery script and activity prompts that reveal clues as the teens investigate why the beach has so much muck. Students learn about other characters who have a stake in the phenomenon as they uncover the interaction between land use and water quality. Students react to questions and sketch and revise a model that reflects their discoveries about how multiple causes on land are connected to excess nutrients in the Saginaw Bay.