What are the two levels of evolutionary change described in the chapter, and how do they differ?

The two levels of evolutionary change are microevolution and macroevolution. Microevolution involves changes in allele frequencies within populations, while macroevolution encompasses larger-scale changes that occur at or above the level of species, such as the emergence of new species or major shifts in biodiversity.

Microevolution focuses on small-scale changes within a population's gene pool, driven by processes like genetic drift, gene flow, and natural selection. In contrast, macroevolution refers to significant evolutionary changes that can result in the formation of new species and broader patterns of evolution over long time scales, often influenced by major environmental changes.