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.
Consider oxygen as the fuel for our bodies' engines - without it, we wouldn't be able to function properly, just like cars can't run without fuel!
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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