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Biology
Tutor: None Selected Time limit: 1 Day

Mar 20th, 2015

As excess use of fertilizers enter the aquatic ecosystems and leads to algal blooms, the algae die off rapidly. this removes oxygen from water. A lack of oxygen in water kills off fish and other aquatic life. 

Mar 20th, 2015

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Mar 20th, 2015
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Mar 20th, 2015
Dec 10th, 2016
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