Question

compare and contrast breathing in fish and mammals

Answer 1

ANSWER :

Since most of the humans are terrestrial, so they have evolved lungs as main respiratory organ while gills are physiological adaptation to breathe or respire in aquatic environment as found in the fish.

In mammals, terrestrial breathing involves inhalation & exhalation of air and the exchange of gases (oxygen & CO2) has been occured in the alveoli of lungs while in almost fishes, the oxygenation of blood happens via diffusion of, water dissolved oxygen into the surrounding blood vessels when water inhaled from mouth and passes through the lamellae of gills and passes out from the gill cover (operculum) to outside in water.