Assertion: cornea | /r/HasProperty | fused with the skin
Facets:
value: to form a single structure
type: PURPOSE
value: always
type: TEMPORAL
Source sentences:
text: In lampreys, the cornea is solely an extension of the sclera, and is separate from the skin above it, but in more advanced vertebrates it is always fused with the skin to form a single structure, albeit one composed of multiple layers.