. Comparative anatomy. Anatomy, Comparative. CHAPTER II THE UROGENITAL SYSTEM EVOLUTION OF THE UROGENITAL SYSTEM The evolution of urinary and reproductive systems may be conveniently discussed as if the two were independent. The Urinary System Metabolism furnishes the necessary chemical foundation of life. But the oxidation of nitrogenous compounds, essential to the process of metabolism, results also in poisonous nitrogenous wastes, which must be removed. It is, therefore, not surprising that all animals have mecha- nisms for removing the ashes of life, intra-cellular mechanisms in the protoz
. Comparative anatomy. Anatomy, Comparative. CHAPTER II THE UROGENITAL SYSTEM EVOLUTION OF THE UROGENITAL SYSTEM The evolution of urinary and reproductive systems may be conveniently discussed as if the two were independent. The Urinary System Metabolism furnishes the necessary chemical foundation of life. But the oxidation of nitrogenous compounds, essential to the process of metabolism, results also in poisonous nitrogenous wastes, which must be removed. It is, therefore, not surprising that all animals have mecha- nisms for removing the ashes of life, intra-cellular mechanisms in the protozoa, porifera, and coelenterates, multicellular in higher FLAME CELLS PROTOPLASMIC PROCESSES >^---. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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