The document provides an overview of key concepts in ecology, including: 1) It describes five levels of ecological organization from the biosphere level down to the individual organism level. 2) It explains the interdependence between organisms and their environment and how ecological models are used to study these relationships. 3) It discusses important ecological concepts such as producers, consumers, trophic levels, biogeochemical cycles, and energy flow through ecosystems.

5. Making an Ecosystem Model Section 1 Introduction to Ecology

7. Levels of Organization Section 1 Introduction to Ecology

13. Comparing Biotic and Abiotic Factors Click below to watch the Visual Concept. Visual Concept Section 2 Ecology of Organisms

18. Niche Click below to watch the Visual Concept. Visual Concept Section 2 Ecology of Organisms

23. Comparing Consumers and Producers Click below to watch the Visual Concept. Visual Concept Section 3 Energy Transfer

25. Food Chain in an Antarctic Ecosystem Section 3 Energy Transfer

26. Food Web in an Antarctic Ecosystem Section 3 Energy Transfer

28. Energy Transfer Through Trophic Levels Section 3 Energy Transfer

31. Water Cycle Section 4 Ecosystem Recycling

32. Water Cycle Click below to watch the Visual Concept. Visual Concept Section 4 Ecosystem Recycling

34. Carbon Cycle Section 4 Ecosystem Recycling

35. Carbon Cycle Click below to watch the Visual Concept. Visual Concept Section 4 Ecosystem Recycling

37. Nitrogen Cycle Section 4 Ecosystem Recycling

38. Nitrogen Cycle Click below to watch the Visual Concept. Visual Concept Section 4 Ecosystem Recycling