Which concept refers to the macroevolutionary changes occurring on a large scale?

The concept that refers to macroevolutionary changes occurring on a large scale is indeed massive-scale macroevolutionary changes. This term encompasses significant evolutionary transformations that lead to the emergence of new species, substantial diversification of life forms, and large-scale patterns and processes that shape the tree of life over long geological time periods.

Massive-scale macroevolutionary changes can include events such as mass extinctions, adaptive radiations, and the overall diversification of species into new ecological niches. These changes are often driven by a combination of factors, including environmental shifts, geological events, and the interactions between different species. Understanding this concept is crucial because it highlights how evolution not only occurs at the level of individual species (microevolution) but also at a broader level that can reshuffle the entire biosphere.

In contrast, microevolution focuses on small-scale changes, such as genetic variations and adaptations within a species. Character changes can refer to specific alterations in traits among organisms, while speciation events are specific instances of one species evolving into two or more distinct species. Nevertheless, these concepts do not capture the broader picture of large-scale evolutionary processes that are discussed within the framework of massive-scale macroevolutionary changes.