Question

Give reasons for the adaptions of aerial life of birds

Answer 1

Presence of wings,streamlined body.... Pneumatic bones present enables for aerial adaptations..

Answer 2

1 ) the bones of birds are hollow which decreases the weight hence
s which is useful fort's help to fly.
2 ) there shape is like streamlined and spindle.this reduces the resistance while flying.
3 ) the forelimbs of all the birds are modified in to wing them to fly. 
4 ) the exoskeleton is of lighter.
          i hope it helps....................................................^_^