What is the primary focus of coevolution?

Coevolution primarily focuses on the mutual dependencies between species and how their evolutionary paths influence one another. This concept highlights the dynamic interactions between two or more species, where changes in one species can trigger adaptations in another. For example, a predator-prey relationship often leads to coevolution, where the predator develops more efficient hunting strategies while the prey evolves better defenses. This interlinked evolution showcases how species can shape each other's characteristics and survival strategies over time, illustrating the intricate web of relationships that define ecosystems.

The other options do not capture the essence of coevolution. The evolution of a single species suggests a more isolated process that does not consider interactions with other species. Random mutations within a species relate to genetic changes that might not necessarily involve other species. Isolated evolution due to environmental changes refers to how species may evolve independently in response to different ecological pressures, rather than in relation to each other. Each of these concepts misses the core idea of coevolution, which is fundamentally about the reciprocal adaptations between interacting species.