Well... I think you meant oxygen, and it happens in the leaves or the stomata, they open up during the day and close during the night.
They both are active, unlike potential energy.
The medulla oblagonta. Its main function is to send signals to the muscles that control respiration to cause breathing to occur.
Answer:
In Science last year, they called them, Parasitic Plants
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Answer:
It is either A or D, im not sure what the bubbles represent either o2 or co2.
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