Assertion: earthworm's receptor | /r/HasProperty | light
Facets:
Source sentences:
text: Earthworms have no eyes, but they have light receptors, so they can detect between light and dark.
text: Seeing : Earthworms have no eyes, but they do have light receptors and can tell when they are in the dark, or in the light.
text: Earthworms lack eyes, but they do have light receptors—called photoreceptors—on their skin.