In a sealed terrarium, CO2 and water
(H2O) (in the presence of photons from
sunlight) are converted into sugars
(CH2O)n and oxygen
plants through a process call photosynthesis.
Plants release litter (dead plant material) that
gets decomposed (eaten and metabolized) by small
organisms (like bacteria and fungi) in the
terrarium’s soil. This process releases
CO2 back to the terrarium air and
consumes O2 (it also releases nutrients
which plants take up by the roots to grow).
Plants also metabolize some of the sugars they
produce (they breathe too!), therefore also
consuming some O2.
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