Here's a breakdown of what evolution encompasses:

* Change over time: Evolution is not a static state, but a continuous process. Organisms change their characteristics and traits through generations.

* Heritable traits: These changes are based on alterations in the genetic makeup of individuals, which can be passed down to offspring.

* Natural selection: This is a key driving force behind evolution. Organisms with traits better suited to their environment are more likely to survive, reproduce, and pass on those traits to their offspring.

* Speciation: Over long periods of time, evolutionary changes can lead to the formation of new species that are distinct from their ancestors.

It's important to remember that evolution is not a linear progression towards perfection, but a complex process of adaptation and diversification shaped by environmental factors.