What is the process called when organisms acquire oxygen from outside the body to break down food sources?
Respiration
Living organisms need energy, which they obtain by breaking down food molecules such as glucose inside their cells.
Respiration is the process of taking in oxygen from the surroundings and using it to oxidise food, releasing energy as ATP along with carbon dioxide and water.
Digestion breaks food into simpler molecules without releasing cellular energy, photosynthesis makes food using light, and fermentation breaks down food without oxygen, so only respiration fits.
Hence, Respiration.
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