X1014321341-00201-47666</DOCNO> The Living Environment: Lessons 6-8 The Living Environment-Lessons: 6-8 Food Webs in the Bay Mary Lou Carmack Frost Middle School Fairfax, VA Benchmarks 5D Interdependence of Life (6-8) #1 In all environments-freshwater, marine, forest, desert, grassland, mountain, and others-organisms with similar needs may compete with one another for resources, including food, space, water, air, and shelter.