Category:Respiratory system
From Infogalactic: the planetary knowledge core
The respiratory system is the biological system of any organism that engages in gas exchange. Even trees have respiratory systems, taking in carbon dioxide and emitting oxygen.
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Subcategories
This category has the following 2 subcategories, out of 2 total.
Pages in category "Respiratory system"
The following 15 pages are in this category, out of 15 total.
