(Answered) Example of microevolution or macroevolution

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Question: Suppose a herd of horses were living in an area where food near the ground was scarce but there was plenty of food in the trees. If, after several generations, the horses gave rise to giraffes that could easily reach the food in the trees, would this be an example of microevolution or macroevolution? Provide justifications and citations for your responses.

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