<span>Plants take in oxygen all the time for respiration.
Photosynthesis which begins by combining water and CO2, continues in the
"dark phase" in making the glucose molecule. Light is not used for this
part of the reaction so it is called dark , because light is needed for
the first part.
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It would grow about 3-5 inches per year.
The first one is commensalism. The second one is mutualism. The last one is parasitism.