Assertion: keel | /r/HasProperty | the breast bone"
Facets:
Source sentences:
text: The keel is the "breast bone"....flattened and elongated in birds to give a place for the wing muscles to attach...allowing more power for flight.
text: The keel is the "breast bone"....flattened and elongated in birds to give a place for the wing muscles to attach...allowing more power for flight.