Annual rings in wood are evidence that in climates with a single annual growing season, the divides actively when water is plentiful and temperatures are suitable for growth, and ceases to divide when water is scarce and the weather is cold.

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.

we would need to see the picture to answer it

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.