The document discusses food chains and trophic levels within ecosystems. It defines producers as autotrophs that create their own food through photosynthesis, such as grass. Primary consumers or herbivores, such as rabbits, eat the producers. Secondary consumers or carnivores, such as hawks, consume the primary consumers. Decomposers like bacteria break down dead organisms and cycle nutrients in the ecosystem. Most natural food chains interact forming complex food webs.

2. Food Chain A path of food consumption beginning with the sun. Example: Sun Grass Rabbit Hawk Bacteria

8. Forest Food Chain Sun Grass Grasshopper Toad Snake Hawk Bacteria