Answer:
Darwin's theory of evolution does not suggest that one species directly evolves into another species. Instead, it proposes that species can evolve from common ancestors over a long period of time through a process of natural selection. Therefore, the fact that fishes still exist on the planet does not contradict Darwin's theory. Here are some possible reasons why:
- Diversification: Fishes have diversified into many different species over time, each adapted to a particular environment and niche. Therefore, the fact that some fishes evolved into amphibians does not mean that all fishes disappeared.
- Environmental factors: The evolution of fishes into amphibians may have been driven by changes in the environment, such as the availability of water or the development of new predators. However, not all fish species would have been affected equally by these changes, and some may have continued to thrive in their existing habitats.
- Adaptation: Fishes have evolved many different adaptations that allow them to survive in various environments. Some fish species are well-adapted to living in freshwater, while others are adapted to saltwater or deep-sea environments. These adaptations have allowed fish species to survive and thrive in different ecosystems.
- Evolutionary time: The evolution of species takes place over a very long period of time, and it is not necessarily a linear or predictable process. Even if some fish species did evolve into amphibians, it is possible that other fish species continued to evolve and diversify in other ways, leading to the continued existence of fish on the planet.
In conclusion, the fact that fishes still exist on the planet does not contradict Darwin's theory of evolution. Evolution is a complex and ongoing process, and the survival of different species depends on a variety of factors, including environmental conditions, adaptation, and diversification.