The correct answer is Pyramid of food web. Explanation & Key Takeaways: Pyramid of food web. • A food web consists of all the food chains in a single ecosystem. • Each living thing in an ecosystem is part of multiple food chains. • Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem. • All of the interconnected and overlapping food chains in an ecosystem make up a food web. • Organisms in food webs are grouped into categories called trophic levels. • Roughly speaking, these levels are divided into producers (first trophic level), consumers, and decomposers (last trophic level). Related Concepts: Producers • Producers make up the first trophic level. Producers, also known as autotrophs, make their own food and do not depend on any other organism for nutrition. • Most autotrophs use a process called photosynthesis to create food (a nutrient called glucose) from sunlight, carbon dioxide, and water. Consumers • The next trophic levels are made up of animals that eat producers. These organisms are called consumers. • Consumers can be carnivores (animals that eat other animals) or omnivores (animals that eat both plants and animals). • Omnivores, like people, consume many types of foods. People eat plants, such as vegetables and fruits. • We also eat animals and animal products, such as meat, milk, and eggs. We eat fungi, such as mushrooms. • We also eat algae, in edible seaweeds like nori (used to wrap sushi rolls) and sea lettuce (used in salads). Bears are omnivores, too. • They eat berries and mushrooms, as well as animals such as salmon and deer. Detritivores and Decomposers • Detritivores and decomposers make up the last part of food chains. Detritivores are organisms that eat non-living plant and animal remains. • For example, scavengers such as vultures eat dead animals. Dung beetles eat animal faces. • Decomposers, like fungi and bacteria, complete the food chain. Decomposers turn organic wastes, such as decaying plants, into inorganic materials, such as nutrient-rich soil.