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    Metatherian and Eutherian Grades of Organization

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    I need to compare and contrast metatherian and eutherian grades of organization in extant fauna in great detail. Please do not take this if you cannot give me a complete answer!!!
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    There are several physiologial differences between eutherial and metatherial mammals, most of them dealing with the reproductive and urinary systems, however, the single basic distinction is that the metheria are the marsupial (or pouched) mammals that give live birth, but the young are not nearly developed enough to survive on their own and must continue ...

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    The expert examines metatherian and eutherian grades of organization. Extant fauna grades are found.