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Eutrophication can happen in a body of water with too many phosphates. Since phosphorous is what limits the number of algae to grow in a body of water, the algae growth will increase by a substantial amount. When the algae die, bacteria must decompose it. They use oxygen to do so. This harshly limits the oxygen available for the organisms living in the lake, like fish. It can lead to animals dying off.

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Q: What happens when there is too much phosphorus in the water?
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