This document outlines a 4th grade science lesson plan focused on ecosystems and interdependence between living and nonliving components. The lesson plan involves taking students on a field trip to the park to observe different plant and animal species in their natural habitats. Students will record the species they observe, where each species is naturally found, and how each species depends on and interacts with other organisms for survival. Back in the classroom, students will create a world map showing the interconnections between species by plotting each one in its native habitat and color-coding relationships of dependence.