Final answer:
Microevolution refers to small-scale changes within a species, while macroevolution refers to large-scale changes resulting in new species.
Step-by-step explanation:
Microevolution refers to small-scale changes that occur within a species over time. This can include variations in traits, such as color or size, due to genetic mutations and natural selection. One example of microevolution is the development of antibiotic resistance in bacteria.
Macroevolution on the other hand, refers to large-scale changes that result in the formation of new species. This typically occurs over long periods of time and involves the accumulation of multiple microevolutionary changes. An example of macroevolution is the evolution of mammals from reptiles millions of years ago.