Here's why:

* Evolution is a continuous process: It's not a one-time event, but rather a constant change in the genetic makeup of populations over time.

* Life exists in diverse environments: From the deepest oceans to the highest mountains, from scorching deserts to icy tundras, life has adapted to thrive in a vast array of environments.

* Adaptation is key to survival: Every environment presents its own unique challenges. Organisms that possess traits that allow them to better survive and reproduce in their environment are more likely to pass on those traits to their offspring, leading to gradual changes in the population over time.

Therefore, evolution has occurred, and continues to occur, in every corner of the globe where life exists, including:

* Land: Forests, deserts, grasslands, mountains, etc.

* Water: Oceans, lakes, rivers, etc.

* Air: Birds, insects, etc.

It's important to note that evolution is not a goal-oriented process. It doesn't have a specific destination. Instead, it is a continuous process of adaptation to the ever-changing environment.