The oak tree had its largest increase in diameter in its fifteenth year. During this year, the average daily rainfall was substantially higher than in previous years. The tree's rate of growth was very small in the tree's fourteenth year, during which average daily rainfall was also high but did not result in significant growth.
According to the evidence, the amount of rainfall cannot be the only environmental factor that influences a tree's growth because the year with the most rainfall did not correspond with the highest growth rate. Other factors, such as soil quality, temperature, sunlight exposure, and competition for resources, likely played a significant role in determining the tree's growth patterns.
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