Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: While studying the rings in a fossilized tree trunk, a scientist notices a group of rings that are closer together than the other. This means that
during those years, there was less precipitation
Faster growth rate during that period.