Question

3
What will be more useful for the birds to fly air or wind?​

Answer 1

Explanation:

Birds have hollow bones that are very light and strong. Their feathers are light and the shape of their wings is perfect for catching the air. Their lungs are great at getting oxygen and very efficient, so they can fly for very long distances without getting tired.

Wind moving toward a bird with spread wings can hold the bird up, thanks to the airfoil shape of the wings (see airfoil illustration above). Birds that fly on moving air currents often have long, narrow wings, such as gulls and albatrosses.

Answer 2

Answer:

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