Which statement about bird flight is true?

Question

Quizplus · Accepted Answer

Bird wings act as airfoils, but they cause air to flow faster over the top of the wing rather than underneath. This difference in speed creates lower pressure above the wing and higher pressure below, generating lift. For flight, this lift must counteract the force of gravity to keep the bird airborne. Statements A and B are incorrect because birds do not need to be within a thermal to fly (they can use flapping flight) and small birds like sparrows do not spend most of their time soaring; this is more characteristic of larger birds. Statement C is incorrect because it inaccurately describes how air flows around a bird's wing.

Which Statement About Bird Flight Is True