Who am I? I am a colorless, odorless, tasteless gas. I make up 78.08% by volume of Earth's atmosphere. I am an essential part of amino acids and nucleic acids, both of which are essential to all life - plants, animals, insects, etc. - on Earth. When I am in my liquid state, my temperature is -321 degrees F below zero and I can then be used for cooling and freezing things. E-mail me with your answer at dwilliams@reading.k12.ma.us Include the element's chemical symbol. Image taken from: wikipedia.com
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