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1 A large quantity of fertiliser has been washed into a stream. Decide whether the following 'rise' or 'fall'.
a) Concentration of minerals in the water b) Total biomass of algae c) Light levels below the surface d) Amount of photosynthesis below the surface e) Mass of decomposing organic matter f ) Number of bacteria g ) Amount of respiration below the surface h ) Amount of oxygen dissolved in the water i) Number of mayfly nymphs in the water j) Number of fish in the water
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