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How are the limbs of the birds adapted for avian life?
a. Birds have a __________ shaped body adapted for its flight.
b. The __________ of birds are modified into wings for flight.
c. The __________ of birds are adapted for walking, perching or swimming.
d. The __________ present in the bird's lungs, make the bird lightweight.
e. The body of birds is covered with __________.
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