The way I see it is that its for maximum protection.
Tree trunks is that trees middle position.
tree trunks have xylem and phloem
A tree with multiple trunks is called a "multi-trunk tree."
A tree usually has fewer trunks than branches. Trunks are the main upright structure of a tree that supports the branches, while branches are the smaller offshoots that grow from the trunk.
Lichen is a combination of fungus and algae. It grows on tree trunks.
Tree trunks are straight and branchless in their lower parts in their efforts to grow tall.
Woodpeckers tap on tree trunks. They are looking for insects to eat when they do this. Woodpeckers have a red head.
None.
centimeters
Some are, some are not.
Brown, of course!
Multiple trunks