Question

Why do birds, aeroplanes and fish have streamlined bodies?​

Answer 1

Birds have streamlined body so as to reduce the air resistance during flying. Whereas fishes have streamlined body so as to reduce friction in water and help them to move faster

Answer 2

Explanation:

Birds have streamlined body so as to reduce the air resistance during flying.

Fishes have streamlined body so as to reduce friction in water and help them to move faster.

Aeroplanes are streamlined in order to reduce the drag(friction in air) which results in more speed and consumption of less fuel.