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Poll
What percentage of nature vs. nurture dictates human intelligence?
100% Nature
75% Nature; 25% Nurture
50% Nature; 50% Nurture
25% Nature; 75% Nurture
100% Nurture
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Gas exchange
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Description
Oxygen moves from the alveolus into the blood, binds to hemoglobin in a red blood cell, and is carried to the cells of the body. Carbon dioxide comes from each cell as a waste product of ¬metabolism. It dissolves in the blood or binds to hemoglobin and is carried to the lungs where it is exhaled by the lung.  
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