This Powerpoint is for a high school Biology I class and covers relationships between organisms in Ecology. This also covers symbiotic relationships as well as biogeochemical cycles . Presentation has several links to images and video clips that can be used as examples of topics/concepts within the lesson. The notes for each video link gives how I relate the clip to the concept covered and at what part of the clip I show. Some of these clips are from the documentary "Planet Earth" from the Discovery Channel. These episodes are great examples in covering the concepts for this chapter. I have also included notes for each slide of topics of discussion that I use. The two week instructional time is based on a high school 4x4 schedule and is dependent on the number of activities used within the lesson. There is a bundle for this lesson in my store. My class uses the Biology Coloring Workbook from the Princeton Review. I have included this for Jr. High classes as well depending if your state includes this in your curriculum.