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Oxygen
A chemical element with symbol O and atomic number 8, essential for aerobic respiration in living organisms and a component of the Earth's atmosphere.
Multicellular Eukaryote
An organism made up of multiple cells that have a nucleus and organelles, including animals, plants, and fungi.
Aerobic Respiration
A metabolic process in which cells convert biochemical energy from nutrients into ATP, with oxygen as the final electron acceptor.
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