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The widely known genus Eodelphis is almost certainly not didelphid. Among its
more conspicuous differences from the Didelphidae are the single- (not double-)
rooted, much reduced first lower premolar and the presence of three, not four, ...
(The Ctenodactylidae are known from the Eocene of Kazakhstan, however.) ...
can be recognized from teeth, but most of them are not known from skeletons,
and the evolutionary status of the modern locomotor conditions is not well known.
The reference Coordinate frames used in mechanics are known as coordinate
sys- systems terns, with mutually perpendicular axes (lines) emanating from a
point known as the origin; for motion parallel to a fixed plane two axes are
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