When a tree is cut down, the trunk of the tree shows a series of rings all having the same center. Each ring represents the amount of tree growth in one year. By measuring the distance between tree rings, scientists can measure tree growth per year. The graph shows the results of measuring tree ring growth in nine different tree species from the same forest.
All of the trees experience the same environmental conditions. Explain why there are differences in growth among the different tree species. Cite evidence from the graph to support your explanation.
