Assertion: whale's ancestor | /r/RelatedTo | artiodactyl
Facets:
value: closely
type: DEGREE
Source sentences:
text: These fossils, which date from only 15 to 20 million years after the demise of the dinosaurs 65 million years ago, prove that the ultimate ancestors of whales were closely related to artiodactyls, the even-toed, hooved mammals represented today by pigs and sheep.