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period 3 Davies

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maryann carroll

on 3 February 2014

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Transcript of period 3 Davies

Why do trees have bark ?

Underneath the bark is the cambium layer. What the bark does for trees, skin does for humans.It shields the inner wood and cambium layer. It repays the trees by giving it water that the bark catches.
The bark defends the cambium from the incredible heat.
The bark shields it from abnormal temperatures.
On the bark there are porous that the tree can breathe though.
It acts like a scab to shield from diseases.
The cambium is a very thin layer
The cambium is the cover for the wood.
Towards the outside phloem is produced. Towards the inside xylem is produced.
By Crystal Davies
"Go-Grolier." ( 2010), http://www.go-grolier.com/
"Google." (2001), http://www.Google.com/
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