● `color{Brown}"Respiration"`: Respiration is by `color{Violet}"gills"`, which are naked or covered by `color{Violet}"operculum"`. `color{Violet}"Air bladder"` helps in respiration in lung-fishes (Group - Dipnoi)
● `color{Brown}"Circulation"`: Heart is two chambered, known as `color{Violet}"Venous heart"` as it contains only impure blood, which goes to gills for purification from heart. The pure blood is then distributed to all parts of body directly from gills so there is `color{Violet}"single circulation of blood"`.
● `color{Brown}"Excretory Matter"`: Cartilaginous fishes excrete `color{Violet}"urea"`, Marine bony fishes excrete `color{Violet}"trimethylamine oxide (TMAO)"` and fresh water bony fish excrete `color{Violet}"ammonia"`. Urinary bladder is absent.
● `color{Brown}"Respiration"`: Respiration is by `color{Violet}"gills"`, which are naked or covered by `color{Violet}"operculum"`. `color{Violet}"Air bladder"` helps in respiration in lung-fishes (Group - Dipnoi)
● `color{Brown}"Circulation"`: Heart is two chambered, known as `color{Violet}"Venous heart"` as it contains only impure blood, which goes to gills for purification from heart. The pure blood is then distributed to all parts of body directly from gills so there is `color{Violet}"single circulation of blood"`.
● `color{Brown}"Excretory Matter"`: Cartilaginous fishes excrete `color{Violet}"urea"`, Marine bony fishes excrete `color{Violet}"trimethylamine oxide (TMAO)"` and fresh water bony fish excrete `color{Violet}"ammonia"`. Urinary bladder is absent.