What does "multiplication of species" highlight in evolutionary biology?

The phrase "multiplication of species" in evolutionary biology emphasizes the idea that diversification occurs as a gradual process through mechanisms such as adaptation to different environments and natural selection. This concept aligns with the understanding that over long periods, species can evolve and branch off into new forms, leading to the rise of various species from a common ancestor.

This gradual process is essential in explaining biodiversity, as it suggests that through the accumulation of small changes over time, species can adapt to their surroundings and develop unique traits. This adaptation can lead to the emergence of new species as populations become isolated or exposed to different environmental pressures. The notion of diversification through gradual evolution is a fundamental principle in evolutionary theory, reflecting the dynamic nature of life on Earth.