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.
A psychological adaptation, also known as evolved psychological mechanism (EPM) , is evolved human or animal behavior resulting from evolutionary pressures. It could serve a specific purpose, have served a purpose in the past (see vestigiality), or be a side-effect of another EPM (see spandrel (biology)).