Organisms depend on one another through food chains and webs. Producers like plants generate food from sunlight. Decomposers break down dead matter. Consumers include herbivores that eat plants, carnivores that eat other animals, and omnivores that eat both. Food chains show how energy passes from organism to organism as each is consumed. Multiple overlapping food chains make up a food web. Predators hunt prey for food. Energy pyramids illustrate that less energy is available at higher trophic levels.