Summary[]
Adaptation is the ability to survive and adapt to different situations and/or natural environments.
This can include developing abilities to breathe underwater or in air with variable compositions, withstand different atmospheric pressures, live in much colder or hotter climates, see in greater darkness, develop camouflage coloring to hide from threats, etcetera.
As opposed to Reactive Evolution, Adaptation only gives a character the ability to balance the resources of its current body, not to, for example, grow more durable or powerful.
Another possible utilization of adaptation is psychological through intricate problem solving thinking pattern skills.