Evolution of cetaceans/Definition

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https://en.citizendium.org/wiki/index.php?title=Evolution_of_cetaceans/Definition&printable=yes
A definition or brief description of Evolution of cetaceans.

Whales, dolphins and porpoises are descendants of land-living mammals, and remnants of their terrestrial origins can be found in the fact that they must breathe air; their fin bones look like jointed hands; and their spines movement has characteristics of a running mammal.

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