Why do plants not need a respiratory system

Asked Nov 08, 2012
Plants intake carbon dioxide gas and use it with the suns energy (photosynthesis) to support growth and stay alive. They output the oxygen our respiratory systems need for life.
Answered Nov 08, 2012
It's just as Rob says. In short, they do have a respiratory system. They just don't have lungs.
Answered Nov 09, 2012
Same as written above and so that they don't need lungs.
but I add that each part of the plant - the roots, stem and leaves respire independently so they don't require a lung...
Answered Nov 09, 2012

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