a thermodynamic quantity equivalent to the capacity of a physical or biological system to do work
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total energy or nutrients assimilated by an organism, a population or an entire community
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percentage of energy transferred from one trophic level to the next
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rate at which an ecosystem accumulates energy or biomass, excluding the energy it uses for respiration
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consist of dead and decaying remains of plants and animals as well as animal wastes such as manure and bone meal
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mined from rocks and deposits and then converted into different forms are blended together to give appropriate balance of minerals for a particular crop
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competing organisms
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poisonous chemicals that kill pests
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using organisms that are either predators or parasites of the pest organism
