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organisms that capture energy from sunlight or chemicals and use that energy to produce food
autotrophs that use light energy to power chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohydrates
a heterotroph that obtains energy by feeding on plant and animal remains and other dead matter
feeding relationships among various organisms in an ecosystem form a network of complex interactions
a diagram that shows the relative amounts of energy or matter contained within each trophic level in a food chain or web
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