Which phenomenon describes the gradual change in species from one environment to another?

The correct choice, which is "succession," refers to the gradual process through which ecosystems change and develop over time. This can occur, for instance, after a disturbance in an environment, such as a fire or human activity, leading to a series of ecological changes. During succession, species in an area may gradually change as the ecosystem evolves to support new plant and animal communities. This transition often involves the establishment of pioneer species that modify the environment, making it more suitable for subsequent species to thrive.

In the context of this question, succession is specifically linked to the gradual change in ecological composition and the interplay between species in response to shifting environmental conditions. This concept helps us understand how ecosystems respond to changes in habitat, and how specific species are replaced over time as conditions evolve. Other concepts like evolution, extinction, and migration describe different processes in biology, but they do not specifically capture the gradual ecological shift that succession entails.