What is the evolution of the modern horse with a single hoof on each limb from a dog-sized ancestral species with multiple digits an example of?

Question

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The evolution of the modern horse from a dog-sized ancestral species with multiple digits to a horse with a single hoof on each limb is an example of macroevolution. This is because it involves dramatic changes in the structure and function of the organism, including the loss of digits and the adaptation to running on a single toe.

What Is the Evolution of the Modern Horse with a Single