Assertion: jellyfish's system | /r/CapableOf | detect light
Facets:
Source sentences:
text: While jellyfish do not have eyes or a visible brain, these beautiful creatures have a strong nervous system that can detect light, odor and external stimuli that generates appropriate response, thus making them mysterious and intimidating in many ways.
text: If they only had a brain, but they don’t; jellyfish have a very basic central nervous system that detects light, vibrations and water changes.