And that these diagrams are used to explain feeding relationships among populations in an ecosystem. This diagram and a few science related terms such as food chain and ecosystem are on a sheet of paper that is then distributed to the class. The teacher continues on to write three words on the board, each with its own column. The teacher explains that the sun could also be considered as part of the food chain. It would be placed before the plant in the diagram.
All life depends on the plant's ability to use sunlight as a source of energy.
The concept of a food web will be touched upon for later use. This term would also be included on the sheet of paper. The teacher instructs them to offer suggestions as to what animals in the forest ecosystem fall under what categories. If students are having difficulties, she may share trade books or other resources with the class. She also goes into detail about the new category, plant and animal eaters.