Two bunches of fresh leaves were weighed on an equal arm balance as shown below. One of the bunch of leaves was then placed in the hot sun for several hours. The leaves were then placed back onto the arm balance again. The drawing below shows what happened.
(a) Which bunch of leaves was placed in the sun?
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(b) Explain your answer in (a).
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(a) Bunch A.
(b) Bunch A was in the sun far too long. It burnt and it became lighter.
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