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| The New Dictionary of Cultural Literacy, Third Edition. 2002. |
| oxygen |
| An element, normally a gas, that makes up about one-fifth of the atmosphere of the Earth. Oxygen is usually found as a molecule made up of two atoms. Its symbol is O. | 1 |
| ‡ When we breathe in oxygen, it is carried by the hemoglobin in our blood throughout the body, where it is used to generate energy by oxidation. (See respiration.) | 2 |
| ‡ Oxygen is a waste product of green plants and photosynthesis. | 3 |
| The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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