Question

how do aquatic animals like fish get oxygen for their respiration in water

Answer 1

Explanation:

Terrestrial (land) animals, inhale air through their noses, mouths, and even their skin, to bring oxygen to their lungs. Water has oxygen too. Fish get the oxygen their bodies need by pumping water over their gills. That's why fish keep opening and closing their mouths all the time: they're breathing.

Answer 2

Aquatic animals may breathe air or extract oxygen that dissolved in water through specialised organs called gills, or directly through the skin.