Which risk increases for birds during long-distance migration when air sac oxygen levels become insufficient?

A)Increased susceptibility to parasitic infection

B)Decreased flight muscle aerobic capacity✓

C)Elevated core body temperature instability

D)Accelerated dehydration from respiratory water loss

💡 Explanation

When air sac oxygen levels decline, diffusion and convective efficiency reduces because blood oxygen saturation decreases and ATP output falls, weakening respiration and reducing efficiency. Therefore decreased aerobic capacity results, rather than infection susceptibility, temperature instability, or drastic dehydration, which depend on other triggers.

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Which risk increases for birds during long-distance migration when air sac oxygen levels become insufficient?

💡 Explanation

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