I want to know the answer to the following question:
What part of a tree opens and spreads out more as it matures?
All the background I'm provided with is that "Since each succeeding ring is laid down on the outside of the wood previously formed, it follows that unless a tree materially increases its production of wood from year to year, the rings must necessarily become thinner as the trunk gets wider.". Is that enough to answer the question?
Answer: no