Assertion: crab's gill | /r/Desires | metabolic energy
Facets:
value: to pull water
type: PURPOSE
value: like other specialized gills
type: OTHER
Source sentences:
text: Internal gills, like other specialized gills, need metabolic energy to pull water over the respiratory surface.:622 To induce a current into the branchial chamber the crab uses back and forth movements of an appendage called the scaphognathite.