Flightless birds lack

Wings

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Keel in Sternum

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Both A and B

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Feathers

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Solution

The correct option is C Both A and B
A) Flightless birds like penguins and ostriches have modified wings or no wings.
B) Flightless birds do not have keel, oil glands, pygostyle and syrinx.
C) Flightless birds lack a keel and wings.
D) Flightless birds have feathers that do not aid in flight.
So the correct answer is 'Both A and B'.

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