"Jan Lam Jr (geen mail)"  wrote in message
news:7923F642-BB68-4873-9361-
>
> Of course plants use oxygen! They need light to do photosynthesis, so when
> it's dark, they cannot create oxygen and start using it. During the
> light-period, the should produce more oxygen than they can use at night
btw.
>
> Jan
>
I was oversimplifying.
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