gills

the fish used its gills to extract oxygen from the water.

divers need to protect their gills from saltwater exposure.

the scientist studied the structure of fish gills under a microscope.

some amphibians also have gills during their larval stage.

the gills of a shark are highly efficient at extracting oxygen.

damage to the gills can be fatal to aquatic animals.

we observed the movement of water across the fish's gills.

the polluted water irritated the fish's delicate gills.

the gills are a vital organ for aquatic respiration.

the gills of a mudskipper allow it to breathe air as well.

the fish's gills flared as it swam against the current.