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1.
increased nitrates in the water increase the growth of algae and plants
2.
the algae form a bloom over the water surface, preventing sunlight reaching other water plants
3.
these plants die because they are unable to carry out photosynthesis without light
4.
microbes such as bacteria increase in number as they decompose the dead plants, using and reducing the oxygen content in the water during respiration as they do so
5.
the low oxygen levels can cause aquatic insects and fish to suffocate, and eventually the lake may be left completely lifeless
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