Answer:
Vascular cambium
Explanation:
Vascular cambium usually refers to the narrow layer present in the plant body that distinguishes the xylem from the phloem and that is responsible for the division and multiplication of cells and helps in the secondary growth of plants such as the diameter of the stem.
This vascular cambium plays a significant role in determining the past weather and climatic pattern and formation of woods. This wood formation is a dynamic process and it comprises the annual tree rings that are formed because of the activities of the vascular cambium throughout a year.
These cells can tell when there were plenty and scarcity of water and when the weather was warm and cold.
