In many areas around the United States, and indeed around the world, there exists modern meteorological observational records for at most, the last 100 years, that are used by dendroclimatologists in correlation to tree ring data. These two pieces of data, tree ring and meterological records, can be used together in order to make reconstructions of past climate that will show variations in temperature or moisture. In woody plants such as trees, there is a process of development that must occur in order for the undefined cambium to differentiate into new and deceased wood cells. The method by which this occurs is cell division. Inside this wall, exists the protoplast, various organs such as golgi-vesicles, dityosomes, mitochondrion, an endoplasmic reticulum, and ribosomes.
Dictyosomes are very helpful in the formation of a cell wall during cell division.
During this process of cell wall formation, three fibrous layers are created to make up this final wall. Before the walls thicken fully, the cell expands so that the fibers become intertwined. The structure of the cell wall depends entirely on the function the cell performs for the plant. From this single plant cell, differentiation occrs. At this point, the apical meristem develops a plant body whose cells on the tips of its roots and sprouts are the first to divide.