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the science concerned with the differences in the vital processes in different species of organisms, particularly with a view to the adaptation of the processes to the specific needs of the species, to illuminating the evolutionary relationships among different species, or to establishing other interspecific generalizations and relationships.
the study of the similarities and differences of the vital processes found in various species of living organisms to determine fundamental physiological relationships between members of the animal and plant kingdoms.
The study and comparison of the physiology of different species.
See also: physiology