The total mass of living organisms in a specific area at a given time. - Biomass, A diagram showing the number of organisms at each trophic level in a food chain. - Pyramids of numbers, A diagram showing the total mass of organisms at each trophic level. - Pyramids of biomass, A diagram showing the flow of energy through each trophic level in an ecosystem. - Pyramids of energy, The ratio of useful energy output to the total energy input in a process. - Efficiency, The process by which organisms release energy from glucose. - Respiration, Approximately 90% of this is lost at each stage of a food chain - Energy, An organism that obtains energy by feeding on other organisms. - Consumer, An organism that produces its own food, usually through photosynthesis. - Producer, A diagram that shows the transfer of energy from one organism to another in a linear sequence. - Food chain, A diagram showing a network of interconnected food chains in an ecosystem. - Food web, The removal of metabolic waste products from the body. - Excretion,

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