This is a PowerPoint presentation on Ecology. There are 51 slides in this presentation that is the first of three PowerPoints that cover Ecology. This presentation covers an introduction to ecology and a discussion of why to study it. It also discusses ecosystems and the abiotic and biotic factors that make them up. There are initial discussions on organism impacts in their ecosystems. The cycling of matter is covered (specifically water, carbon and nitrogen). It then covers the cycling of energy (food chains, food webs and energy pyramids). Finally, it covers discussions on different biomes.