One reason is because of its given color. Typically, Algae or moss grows in saturated areas. The reason it is been is because doc its pigment, or chlorophyll found in its anatomy.
the tree is 24 years old. The inner part of the stem of the tree has a part referred to as cambium. Each year cambium produces high number of cells with thin cell walls when tree is highly active. These cells form the light-colored rings. When tree is less active cambium synthesizes few small cells with thick walls. The region occupied by these cells appear as a darker ring on the cross section of the stem. These two processes occur in the same year and as result each growth year is characterized by a ring consisting of a light and dark parts.
The answer is Vestigal. It is a type of anatomical structure that no longer serves any function.
What's the list of Cellular compartments
