Acclimatization change with an individual animal that results from chronic exposure to new, naturally occurring environmental conditions in the animals native environment. Re-adjustments of the range of tolerances. Immediate adaptations modulation of preexisting enzymes. First lineup defense against the adverse effects of environmental change. Animals are optimally adapted.
Many physiological processes are simply good enough to insure survival.
Physiological processes are adaptive if present at high frequency in the population because it results in a higher probability of survival and reproduction Homeostasis tendency of organisms to maintain relative internal stability. Composition of intercellular and extracellular fluids maintained as constant or at least relatively constant. Conformation internal variable is always equal to the environmental variable Regulation internal variable is kept different from the external value. Enantiostasis normal functioning is maintained in the absence of homeostasis. Function rather than state is preserved.