Assertion: chordate's notochord | /r/SimilarTo | primitive backbone
Facets:
Source sentences:
text: The notochord is like a primitive backbone, and it is present at at least some stage of development.
text: show traces of a notochord (a rodlike primitive backbone), a significant step in the evolution of vertebrates.
text: The notochord is like a primitive backbone, and it is present at at least some stage of development.