What do the center portions of a live tree contain?

The center portions of a live tree primarily contain cell cavities filled with water. This area, known as the heartwood and sapwood, is essential for the tree's survival as it helps transport nutrients and water from the roots to the leaves. The vascular system of the tree, particularly the xylem, is responsible for this movement, and the cell cavities are crucial for storing and conveying these vital fluids.

Water is fundamental for various biological processes, including photosynthesis and growth. Hence, the presence of these cavities filled with water plays a vital role in maintaining the tree's overall health and vigor. Understanding this aspect of tree biology is significant in carpentry, as the characteristics of wood can be influenced by its moisture content and the structure of these inner cavities.