What is a key feature of macroevolutionary changes?

A key feature of macroevolutionary changes is that they lead to the creation of new species. Macroevolution refers to large-scale evolutionary changes that occur over long periods, typically encompassing significant transformations that can result in the emergence of novel forms, such as new species or higher taxonomic groups. This process is often driven by mechanisms such as speciation, which can occur through various means, including geographic isolation, environmental changes, or evolutionary pressure.

In contrast to microevolution, which involves small, incremental changes within a population (such as allele frequency shifts), macroevolution entails broader changes that affect entire lineages and can result in speciation events. Such developments can be traced in the fossil record and through genetic analysis, indicating the divergence of different species over time.

The other options describe aspects that do not align with the definition of macroevolution. For example, changes that occur within short timeframes or only affect a single population pertain more to microevolutionary processes. Similarly, the notion that evolutionary changes are reversible does not hold true in macroevolutionary contexts, as the processes leading to speciation often involve adaptations to unique environments that are not easily undone.