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B
wings
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C
feathers
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D
keel
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Solution
The correct option is B wings The forelimbs in birds are modified into wings. Wings help in flight.
The patagium is the fold of skin between forelimbs and hind limbs. It is seen in bats and birds.
The feathers in birds form the outer covering of the skin.
Keel or carina is found in birds. It is an extension of sternum or breastbone to which flight muscles are attached (coloured in blue).