In biology, biological specificity is the tendency of a characteristic such as a behavior or a biochemical variation to occur in a particular species.
Biochemist Linus Pauling stated that
Characteristics may further be described as being interspecific, intraspecific, and conspecific.
Interspecificity (literally between/among species), or being interspecific, describes issues between individuals of separate species. These may include:
Intraspecificity (literally within species), or being intraspecific, describes behaviors, biochemical variations and other issues within individuals of a single species. These may include: