Assertion: blue whale's tail | /r/HasProperty | strong
Facets:
Source sentences:
text: They developed streamlined shape (responsible for graceful movement through the water), transformed their front limbs into fins, reduced their hind legs and developed strong and wide tail (sized like a professional soccer net).
text: Their streamlined shape helps them to gracefully move through water, their front limbs are transformed into fins, their hind legs are reduced and they develop strong and wide tail.