. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . thehigher animals de-pends on a speciali-zation or differentia-tion of parts, dueto the assumption ofdifferent functions orduties bv different IS parts of the body; that the degree of structural differentiationdepends on the degree or extent of division of labor shown inthe economy of the animal. It is obvious that the same prin-ciple of division of labor with accompanying modification ofstructure is the basis of colonial and communal life. It issimply a
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . thehigher animals de-pends on a speciali-zation or differentia-tion of parts, dueto the assumption ofdifferent functions orduties bv different IS parts of the body; that the degree of structural differentiationdepends on the degree or extent of division of labor shown inthe economy of the animal. It is obvious that the same prin-ciple of division of labor with accompanying modification ofstructure is the basis of colonial and communal life. It issimply a manifestation of the principle among individuals in-stead of among organs. The division of the necessary laborsof life among the different zooids of the colonial jellyfish isplainly the reason for the profound and striking, but alwaysreasonable and explicable, modifications of the typical polypor medusa body, which is shown by the swimming zooids, thefeeding zooids, the sense zooids, and the others of the similarly in the case of the termite community, the sol-dier individuals are different structurally from the worker in-.
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