Birds are adapted to aerial life due to

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(D) Birds exhibit several adaptations for flight (aerial life):$1$. Presence of wings: Forelimbs are modified into wings to provide lift and propulsio

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All the above

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(D) Birds exhibit several adaptations for flight (aerial life):$1$. Presence of wings: Forelimbs are modified into wings to provide lift and propulsion.$2$. Light weight of their body: Their bones are pneumatic (hollow),which reduces body weight.$3$. Presence of air marrow: The presence of air-filled cavities (pneumatic bones) further reduces density,making flight easier.Since all these factors contribute to their aerial adaptation,the correct answer is $D$.

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