Producers - Organisms that use an outside energy source to make their own food (glucose) through the process of photosynthesis (using the sun) or chemosynthesis (using chemical energy)., Consumers - Organisms that cannot make their own food., Detritivores - Organisms that consume the dead bodies and wastes that are produced by living things., Herbivores - Organisms that eat producers., Carnivores - Organisms that eat herbivores, omnivores, and even other carnivores., Omnivore - Organisms that eat both producers and consumers., Scavenger - A carnivore that feeds on the bodies of dead or decaying organisms., Food Chain - A simple model (beginning with a producer) that shows one path of food energy in a community or ecosystem., Food Web - A model for energy transfer that shows how many different food chains are interconnected., Energy Pyramid - A model that shows how much energy is available at each link of a food chain (or trophic level in an ecosystem)., 10% - The approximate amount of energy that moves up to the next level in a community or ecosystem, 90% - The approximate amount of energy that is lost (due to metabolism, heat, waste) from one level to the next in an energy pyramid., Trophic Levels - The feeding levels in a community or ecosystem. The first level includes producers, the second level includes herbivores, and the 3rd level (and beyond) includes the carnivores, omnivores, top predator, etc., Photosynthesis - The chemical process that uses carbon dioxide, water, and light to produce glucose and oxygen., Chemosynthesis - The chemical process that uses hydrogen sulfide or methane instead of light to produce glucose (oxygen is not released as a by product)., Primary Consumer - An animal that eats a producer- an herbivore., Secondary Consumer - An animal that eats a primary consumer or other consumer. They are carnivores or omnivores., third level (tertiary) consumer - Organisms that eat secondary consumers. Usually at or near the top of a food chain.,

Energy Flow in Ecosystems

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