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represent the number of organisms at each trophic level in a food chain

represents the total biomass of organisms at each trophic level

organisms such as bacteria or fungi that break down and decompose deaad material

Nitryfing bacteria oxidise the ammonia to make nitrites and then to nitrates in a process called

this gas causes acid rain

these gases trap heat energy from the sun in the atmosphere around the earth

a lack of oxygen in water