Light energy is trapped by producers (plants) in photosynthesis and is the external energy source for most ecosystems. Only a very small percentage of the total light energy is utilised by producers.
Energy is passed through food chains, which are linked with other chains as food webs.
Energy is passed from producers to primary consumers (herbivores), to secondary consumers (carnivores), to tertiary and sometimes quaternary consumers. Each level in the food chain is called a trophic level.
Decomposers (mostly fungi and bacteria) break down the dead organic matter from producers and consumers, and play an important role in nutrient recycling.
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