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.
Phylogenetics. Population genetics. A biological adaptation is an anatomical structure, physiological process or behavioral trait of an organism that has evolved over a short or long period of time by the process of natural selection such that it increases the expected long-term reproductive success of the organism.