The special adaptations of birds all contribute to two factors essential for flight namely, more power and less weight. Explain how each of the following contributes to one of the other or both:

(i) Endothermy

(ii) Respiratory system

(iii) Skeletal system

(iv) Excretory system.

Birds possess several special adaptations to support flight, which hinges on two essential factors: generating more power and reducing weight. The following aspects highlight how specific features of birds contribute to these factors:

(i) Endothermy
Endothermy in birds is their ability to maintain a constant, high body temperature through internal metabolic processes. This adaptation provides more power for ____ _________ ___ ____ ___ ______ ____ _____.
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