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some people grow crops...
...sometimes they use fertilizers to make their crops grow faster...
...when it rains, the fertilizer runs off and into a water source...
...after the fertilizer enters the water, it makes the algae grow...
...when there is too much algae, the sun cannot shine through the surface of algae...
...without sunlight, the plants can no longer perform photosynthesis and they start to die off...
...spreading bacteria uses oxygen to eat the dead algae and can result in taking up all the oxygen...
...without oxygen, the fish and other aquatic creatures die...
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