Oxygen (O)
Definition
Oxygen is a chemical element with symbol O and atomic number 8. It's essential for life on Earth because it's part of water molecules and used by cells for respiration process.
Related terms
Oxidation Reaction: A reaction where atoms lose electrons or gain oxygen atoms.
Respiration: A metabolic process that uses oxygen to generate ATP by breaking down glucose.
Ozone (O3): A molecule composed of three oxygen atoms, found in the Earth's upper atmosphere and protects us from harmful ultraviolet radiation.
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Study guides (1)
AP Biology - 1.2 Elements of Life
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Cram Mode
AP Score Calculators
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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.