This Classroom Connectors lesson plan teaches about the relationships of organisms in ecosystems. Students construct models of ecosystems, recognize different trophic levels, recreate food chains, and differentiate energy flow and nutrient cycling. The site provides goals, objectives, an outline, time required, materials, activities, and closure ideas for the lesson. The Classroom Connectors address content with an activity approach while incorporating themes necessary to raise the activity to a higher cognition level. The major motivation is to employ instructional strategies that bring the students physically and mentally into touch with the science they are studying.