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

The developmental stages of a tree typically encompass various life phases that trees go through as they grow. These stages generally include the seedling, sapling, mature tree, and potentially over-mature timber.

Seedlings represent the initial growth stage where young trees begin to establish themselves from seeds. Saplings follow this stage as the young trees continue to grow and develop more structure. Over-mature timber refers to trees that have reached or surpassed their optimal maturity and may begin to have a decline in health or productivity.

In contrast, logs do not represent a developmental stage of a tree but rather a product that results from the tree's lifecycle once it has been cut down. Logs are sections of tree trunks that have been harvested for purposes like timber production. Thus, while seedlings, saplings, and over-mature timber are integral components of a tree's development, logs do not fit into this classification, as they signify a static state rather than an active phase of growth or development.