The atmosphere, the total content of biological matter on the planet and the Earth’s crust are the three main reservoirs of oxygen. See the full definition for oxygen in the English Language Learners Dictionary, Nglish: Translation of oxygen for Spanish Speakers, Britannica English: Translation of oxygen for Arabic Speakers, Britannica.com: Encyclopedia article about oxygen. “Oxygen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/oxygen. eutrophication Has Greek Roots It is an important parameter for managing patients in a clinical setup. He's making a quiz, and checking it twice... Test your knowledge of the words of the year. CallUrl('evolution>berkeley>edu
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