How much of a tree’s biomass is due to carbon compounds? B. What are the factors at the individual tree-level and the forest-level?

A. How much of a tree’s biomass is due to carbon compounds?
B. What are the factors at the individual tree-level and the forest-level?
C. How do the size and age of a tree affect how much carbon it stores?
D. Why does the number of trees per area affect how much carbon it stores?
E. How does species composition in a forest affect the amount of carbon stored?