Rewrite Freddy s story to make a happy ending instead of a bad one. Talk about food chains. Children make paper chains and illustrate animals and plants to be glued onto the paper chains. Be sure to include plant life and fish in your example food chain for the children. Use a filtration system to clean up Freddy s habitat.
Older students can devise their own filtration system.
Students may compete to see which filtration system cleans the water the best. Fill metal tray with loose soil and pebbles. Tilt tray slightly on one end. Pour 100 ml of water over soil using rain can. Allow water to run onto metal tray with new bed of soil on edge of filled aquarium.