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For an updated and comprehensive look at DO and the technology used to measure it, check out: Dissolved Oxygen, or Measuring Dissolved Oxygen. Dissolved oxygen in water is vital for underwater life. It is what aquatic creatures need to breathe. Dissolved oxygen is often called DO for short.
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the universal solvent because it dissolves more substances than any other liquid.This is important to every living thing on earth.It means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients.nd, water is called the universal solvent because it dissolves more substances than any other liquid. This is important to every living thing on earth. It means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients.