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The definition of macroevolution is a large-scale change in the evolution of a species. An example of macroevolution is when feathers appeared on some dinosaurs evolving into birds. large-scale and long-range evolution involving the appearance of new genera, families, etc. of organisms.
A change on the genetic level of a population is defined as a small-scale change and is called microevolution. Biological evolution also includes the idea that all of life is connected and can be traced back to one common ancestor. This is called macroevolution. Biological evolution is not defined as simply change over time.