Adaptation of an organism to a new environment Active immunity - A type of acquired immunity whereby resistance to a disease is built up by either having the disease or receiving a vaccine to it
The physiological adjustment or adaptation by an organism to new physical and/or environmental conditions With respect to water, it is frequently used in reference to the ability of a species to tolerate changes in water temperature, degradation of water quality, or increased levels of salinity
Any of numerous gradual, long-term responses of an individual organism to changes in its environment. The responses are more or less habitual and reversible should conditions revert to an earlier state. These criteria differentiate acclimatization from homeostasis; from growth and development (which cannot be reversed); and from evolutionary adaptation (which occurs in a population over generations). Acclimatization can occur in anticipation of a change and enable organisms to survive conditions beyond their natural experience. Examples include adaptations to seasonal changes and adjustments to changes in altitude