Which statement is true about the forces involved in an ornithopter and a pterosaur taking off?
a. Gravity acts on both the ornithopter and the prerosaur,
b.Drag acts only on the ornithopter and not on the pterosaur.
c.Thrust resists the motion of the prerosaur and the ornithopter.
d. Lift is the single major factor in the forward movement of the ornithopter.
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