Metallic luster is your answer
It is a protein and it functions in a red blood cell to help carry oxygen
Answer:
A. Robin A will have an easier time finding a mate.
Explanation:
He will have an easier time since he have more songs, which the females find attractive.
Depending on baseline oxygen saturation and the pathological condition of the lungs, risks associated with altitude exposure include profound hypoxemia, pulmonary hypertension, disordered ventilatory control, impaired respiratory muscle function, and sleep‐disordered breathing.