OpenSimulator Archive. OAR file is an OpenSimulator Archive. OpenSimulator is an open source multi-platform, multi-user 3D application server. It can be used to create a virtual environment (or world) which can be accessed through a variety of clients, on multiple protocols.
biological adaptation the adaptation of living things to environmental factors for the ultimate purpose of survival, reproduction, and an optimal level of functioning. color adaptation. 1. changes in visual perception of color with prolonged stimulation.
Vocabulary. 1  Adaptation: A change in an organism over time that helps it to survive in its environment. 2  Behavioral Adaptation: A change in the way an organism responds to its environment over time that increases its chances to survive and reproduce. 3  Characteristic: Trait or feature of an organism.