Fill in the blanks:
Prolonged exposure to high altitudes can _______ changes in the body’s physiology due to the _______ of oxygen.

"Induce" means to cause or bring about a particular effect, which fits well in the context of physiological changes."Scarcity" accurately describes the lack of oxygen at high altitudes."Prolonged exposure to high altitudes can induce changes in the body’s physiology due to the scarcity of oxygen.""Instigate, abundance" is illogical as high altitudes are known for reduced oxygen, not abundance."Evoke, excess" and "Trigger, surplus" are unsuitable since the effects are due to a lack of oxygen, not an excess.