Bark.
The outer bark of a tree protects it.
The cortex means the outer layer like the bark of a tree. The cerebral cortex is the bark (outer layer) of the brain.
sapwood
The outer protective covering of a tree is called the bark
The outer layer of a tree is called the bark.
bark
bark
Bark forms on a tree as a protective outer layer. It helps shield the tree from physical damage, pests, and disease. As the inner layers of the tree grow, the outer bark is pushed out and eventually replaced.
The Inner Bark
Bark
Tree trunks is that trees middle position.
tree trunks have xylem and phloem