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okay, this might be a little confusing because I don't really know how to explain it, but please give it a go?

"The drawing shows a 'bottle garden' which is kept in a brightly lit room. The cork in the neck of the bottle is not taken out.

(Picture of the bottle garden)

The plants in the bottle use oxygen for respiration.

Explain why, over a week, the amounts of oxygen and carbon dioxide in the bottle stay about the same."

I'm really confused :( help me out?