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5 August, 20:08

Why do birch trees have black streaks on their trunk?

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  1. 5 August, 20:23
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    Short answer - to breathe.

    Long answer - the black streaks on the trunk of birch trees are called lenticels, and their function is to enable the exchange of gases between the tree and the air. So, in a way, this makes the whole process of photosynthesis a lot easier for birch trees.
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