Here's why:
* Evolution is inherently about change: The core idea of evolution is that life on Earth has not been static, but has changed and diversified over billions of years.
* Different mechanisms, same outcome: While theories like Darwin's natural selection, Lamarckism, and neutral theory propose different mechanisms for this change, they all agree that change happens.
* Focus on the process: Even theories that emphasize different aspects of evolution, like punctuated equilibrium vs. gradualism, still acknowledge that the process of evolution involves change.
Therefore, regardless of specific mechanisms, the core concept of change over time is fundamental to all evolutionary theories.
