Assertion: arthropod | /r/HasAspect | no backbone
Facets:
Source sentences:
text: Arthropods are classified as invertebrates because they have no backbone.
text: Arthropods are invertebrates, that is, they have no backbone, and rely instead on an external covering called an exoskeleton.
text: Arthropods are invertebrates, that is, they have no backbone, and rely instead on an external covering called an exoskeleton.