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How do terrariums recycle air?

17 years ago

I know plants take in carbon dioxide and give off oxygen. How does this work as a cycle in a terrarium which is airtight?

I understand that the plant can take in water through the roots, release it from the leaves, and that evaporation and condensation and even precipitation can take place in a terrarium.

So the water cycle makes sense to me, but how is the air recycled?

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