Answers

2015-10-20T19:50:47+05:30
1.the forelimbs of all the birds are modified into wings which is useful for them to fly.
2.the bones of birds are hallow which decrises the weight hence it's help to fly.
3.there shape is like streamed and spindle.
4.this reduces the resistance while flying.
5.the exoskeleton is of feathers which make them lighter.
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