Growth is in response to stimuli and available resources, when one branch interrupts the stimuli of another branch, or uses the same resources better, the other branch adapts and grows toward the next strongest stimuli/uses the resources it has.
Growth is also following an evolutionary pattern in the DNA that is constantly adapting but those changes happen generationally so they are hard to observe as a common person. On top of the fact that a lot of trees that people interact with, especially in urban areas and farms, are essentially clones.
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