A tree can be wounded by natural causes like fire, ice, stroms, and wind or by attacks made by men or animals.In the beginning, the wound 'bleeds', and sap leaks out from the opening. Then, a tissue forms at the edges of the wound,which stops the oozing, and protects the inner tissues. cells from the growth tissue around the edges begin to multiply, and grow inwards till they meet in the centre, and healing is complete. if the wound is very large however, there will be a permanent scar on the tree.
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