Which component is not included in the developmental stages of a tree?

The developmental stages of a tree typically include various life stages that a tree goes through from germination to maturity. The seedling stage represents the initial growth phase when the tree first emerges from the seed. As it grows, it enters the sapling stage, characterized by young trees that are not yet mature but are clearly identifiable as trees. Over-mature timber refers to trees that have reached a point in their lifespan where they may not be growing optimally, and parts of the tree may begin to decline.

In contrast, a log does not represent a developmental stage of a tree. It describes a tree that has already been harvested and processed into a timber product, rather than indicating a part of the tree's life cycle. Therefore, it is not considered in the progression of a living tree's development. Understanding these stages helps in identifying the health and maturity of trees, as well as in making appropriate forest management decisions.