Water is much heavier than air, so most fish a. Ventilate their gills as quickly as they can.

Last updated: 8/14/2022

Water is much heavier than air, so most fish a. Ventilate their gills as quickly as they can. b. Absorb most of their oxygen through their skin. c. Use their tidal breathing more slowly than air breathers. d. Do not use tidal breathing. e. Are denser than most land-based animals.