Gas Exchange

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Webcam Model(Zadaraye) is live
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mucholderthen:From Salameandering:Lungs are what enabled the ancestors of all tetrapods to climb out

Link #lungs #respiratory system #respiration #gas exchange #oxygen #carbon dioxide #cutaneous respiration #alveoli #bronchi #human #salamander #comparison #breath #breathe #breathing #anatomy #physiology #biology #science