I believe the answer is metabolism...
Exchanging oxygen and carbondioxide between air and lungs because it just involves breathing system but everything else involves hormones.........
HOPE IT HELPS !!!
Tables
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1.8.99999999.0
2.10,000,000,000,000,000,000,000,000,000 6,000,000,000,000,000,000, 3 billion 9 million 60,000 I'm sorry I tried♂️