Many bird wings are more convex on the upper surface than they are on the lower surface. This enables the wing to provide greater lift because
A. A. air moves more slowly over the top surface of the wing than over the lower surface.
B. B. air moves more quickly over the top surface of the wing than over the lower surface.
C. C. the pressure above the wing is greater than below the wing.
D. D. the pressure above the wing is less than below the wing.
E. A and C
F. B and D
G. A and D
H. B and C
F. B and D
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