Answers

2015-11-19T11:22:28+05:30
Their forelimbs are modified to wings for flight.
their bones are hollow so that their body doesn't weighs much and it is easier to fly high and long.
0
2015-11-19T11:25:21+05:30
1: they have wings to fly .
2: forelimbs of bird are modified in to life . 
3: shape is streamlined .
4: exoskeleton is lighter 
5: bones are hollow which decreases there weight . 
             i hope it helps......................^_^
1 5 1