Introducing permaculture

Topic: Connections
Subtopic: The web of life
Age: 7 - 12
Holistic Planning: Hand
Details: List all the inputs and the outputs for a common plant or animal (different groups could take different plants/animals), get creative, see how many inputs/outputs you can list. Draw the connections with other plants and animals, can you draw it into a closed loop system where all the outputs become inputs for something else?