Assertion: blue whale's heart | /r/HasAspect | four chambers
Facets:
Source sentences:
text: Besides this, they have several traits mammals generally have: they are able to nurse their babies using their mammary glands, they have warm blood, a heart having four chambers, and they also have hair.
text: Human hearts, like those of all mammals, as well as birds, have four chambers.
text: Crocodilian hearts have four chambers, but unlike mammals they have an extra flap that can close to keep blood from going to the lungs.