The basic problem with your question is that you seem to be asking if an individual tree is an example of evolution in action.
But individuals do not evolve.
Populations evolve. Could this tree be part of a population that is evolving? By definition,
yes, because all organisms that reproduce imperfectly evolve over time. New species do not always result, but genetic change in a population over multiple generations is inevitable.
Realistically, every individual organism is an example of a transitional form, existing as a link in the chain from its ancestors to its descendants. Your tree is no different in that respect.
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