8. no genetic differences were found among the andean population in either oxygen-hemoglobin saturation levels, nor hemoglobin concentrations. however, this group as a whole displayed higher hemoglobin concentration levels than their lower altitude neighbors. the most accurate explanation for this finding is that individuals constantly exposed to lower atmospheric partial pressures for oxygen would have a physiologic response which would

Make greater in size the quantity of cumulative red blood cells.  

Explanation:

Once the amount of pressure decreases (carbon dioxide), the quantity of the pH level normally increases in blood. Hemoglobin is the component in blood that is encouraged of transporting oxygen, once oxygen is inhaled is dissolved into the lungs blood, and altitude influences or affects this process as hemoglobin levels in blood increases as altitude is higher. This results to be a directly proportional relationship.  

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