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Why do leaves fall off trees?

Why do leaves fall off trees?

Update: 2019-05-071
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Description

Have you ever noticed that some trees change in the Autumn? Their leaves can turn from green to red and yellow, and fall to the ground. In this episode Emma wants to know why trees lose their leaves, so tree scientist Matilda Brown helps us to solve the mystery of the falling leaves.
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Why do leaves fall off trees?

Why do leaves fall off trees?