Answer the following question given this paragraph: 

Birds also have wings that function as an aerofoil . The surface of the aerofoil is curved to help the bird control and use the air currents to fly. Aerofoils are also found on the wings of airplanes.


Q: Where are aerofoils found?

 Choices:

- airplanes and plants

- birds and busses

- birds and cars

- birds and airplanes

A:
birds and airplanes
