Assertion: snail's sense | /r/HasProperty | useful
Facets:
value: for searching for prey
type: PURPOSE
value: in the darker depths
type: LOCATION
value: in murky rivers
type: LOCATION
value: especially
type: DEGREE
Source sentences:
text: The sense of sight of snails is useful but only detect changes in the intensity of light to recognize whether it is night or day; They can move their tentacles up or down to improve their ability to see.
text: Their eyes are on the topside of their body and their mouth and gills can be found underneath, so in the darker depths or murky rivers this electromagnetic sense is especially useful for searching for prey.