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...Example the exam paper will refer to this case study in an question as pond features of a small scale ecosystem uk for you have studied explain importance nutrient cycle functioning key idea is made up producers flora and consumers fauna environment there are complex relationships between biotic living abiotic non parts functions through series food chains webs recycling nutrients variety habitats damaging biomass includes all things margins shallow water reeds grow use from using adding or removing species if added mud detritus sunlight they form habitat removed die out affect web photosynthesise insects snails frogs birds increase fish could cause reduction further chain live by eating shortages herons other bottom decomposers insect lava protection drought lack rainfall causes levels dies especially e g worms midge drop margin plants dry lower winter sinks oxygen may kill broken down forming deep plenty layer then re absorb enough offer drainage farmers drain create these their root...