How do plants turn into trees and develop their bark, when at first they started out as these green and really smooth stemmed plants?
In: Biology
The mass of a tree is primarily carbon which comes from CO2 used during photosynthesis.
Hard bark structure can be understood as analogy of nail growing. This bark are the analogous hard nails of tree which grows outwards which fall off in event of animal climbing or scratching the tree protecting the tree and deterring insect from drilling into the stem.
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