B: More efficient hemoglobin in the blood
They can live at higher altitudes, but that is only because they have more efficient hemoglobin in their blood. Because of this, the veins to their heart are bigger, taking in more oxygen.
And because I just did the quick check.
The adaptation that allowed the Tibetans to live at high altitudes is that they have more efficient hemoglobin in the blood. So, the correct option is B.
Adaptations may be defined as any heritable trait that helps an organism such as plants, animals, microbes, etc. to survive and reproduce in its environment.
Tibetans possess a different habitat and live at higher altitudes. They have greater hypoxic and hypercapnic ventilatory larger lungs. Their blood hemoglobin concentration is lower, but the hemoglobin is found to be more efficient in the blood.
Therefore, the adaptation that allowed the Tibetans to live at high altitudes is that they have more efficient hemoglobin in the blood.
To learn more about Tibetans, refer to the link:
https://brainly.com/question/1147231
