Two closed boxes rest on the platforms of an equal arm balance. One box has a ball in it and the other box contains a bird. When the bird sits still in the box, the scale is balanced. What happens to the balance if the bird flies in the box (hovers at the same place inside the box)?
(a) The bird box is lighter.
(b The bird box is heavier.
(c) The bird box is the same.
(d) Not enough information is provided.
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