The process is essentially a polar linear action, or differentiation from a common centre.
The second type of differentiation is that between supporting axis and assimilating appendages.
This difference is marked in the phonetic differentiation of the dental and the alveolar t by writing them respectively t and t.
In accordance with this general distribution snakes show a great amount of differentiation with regard to their mode of life and general organization; and from the appearance alone of a snake a safe conclusion can be drawn as to its habits.
The development of a true insect society among the Hymenoptera is dependent on a differentiation among the females between individuals with well-developed ovaries (" queens ") whose special function is reproduction; and individuals with reduced or aborted ovaries (" workers ") whose duty is to build the nest, to gather food and to tend and feed the larvae.