Question

Birds can fly because they have
(a) a streamlined body
(b) hollow bones
(c) wings with feathers
(d) all of these

Answer 1

The anatomy of birds is such that they have hollow spaces in their bones that contain air pockets. This makes them lightweight, which helps in flight. Also, the wings (modified forelimbs of the birds) are the aerodynamic structures of the birds that provide the necessary thrust needed to fly. Feathers are soft and stiff which helps in flight, also the feathers trap small packets close to the bird's body helping in flight. Thus, birds can fly due to the feathers, wings, and hollow bones

So, the correct answer is All of the above.