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what do producers do

what is the term given to each feeding level

how is energy passed though the ecosystem

how does energy leave the system

how is ebergy lost at each trophic level

why is the food chain limited to 4-5 trophic levels

on death of the producers, how is further energy extracted

what is grss primary productivity

GBP- __________ = net production

what is the name given to the stuff left over after resepration