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It is obvious, however, that cetaceans diverged early into archaeocetes,
odontocetes, and mysticetes, if, indeed, the groups had a common ancestry. The
earliest known fossils are perfectly good whales and clearly are assignable to
one of the ...
Family Rhizomyidae (African mole rats, bamboo rats) Oligocene of Europe, early
Miocene to Recent of Asia, and Pleistocene to Recent of Africa. Myomorphous,
with considerable forward extension of the masseter. Burrowing animals with ...
This article is divided into the following sections: Early units and standards 687
Ancient Mediterranean systems The ancient Chinese system Medieval systems
The English and U.S. customary weights and measures systems 688 The English
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