Which outcome reduces avian thermal stress when ambient temperature increases beyond a thermoregulation threshold?

💡 Explanation

Increased gular flutter facilitates rapid heat dissipation via evaporative cooling; the mechanism involves air sacs accelerating evaporation. This occurs because heat is exhausted quickly, therefore birds maintain core temperature effectively, rather than overheating due to increased metabolic demand or inefficient heat exchange.

• Which outcome occurs in desert plant roots lacking aquaporins?
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