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<p>gas exchange is particularly important for <a href="page.php?w=Respiration_%28physiology%29">respiration</a>, which involves the uptake of <a href="page.php?w=oxygen">oxygen</a>  and release of <a href="page.php?w=carbon_dioxide">carbon dioxide</a> . Conversely, in <a href="page.php?w=photosynthesis">oxygenic photosynthetic organisms</a> such as most <a href="page.php?w=Embryophyte">land plants</a>, uptake of carbon dioxide and release of both oxygen and water vapour are the main gas-exchange processes occurring during the day. Other gas-exchange</p><p>
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