AP BIOLOGY

Detailed explanation-1: -The two animals which breathe through gills are Octopus, Shark, and Fish.

Detailed explanation-2: -Fish breathe through their gills. Gills are respiratory organs full of blood vessels. A fish breathes by taking water into its mouth and forcing it out through the gill passages. As water passes over the thin walls of the gills, dissolved oxygen moves into the blood and travels to the fish’s cells.

Detailed explanation-3: -What Animals Use Their Gills to Breathe? Primarily fish, but also crabs and mollusks use their gills to breathe. Larvae such as tadpoles and the larvae of dragonflies, which live in the water at first, also use their gills to breathe.

Detailed explanation-4: -Dolphins are mammals, not fish. Unlike fish, who breathe through gills, dolphins breathe air using lungs. Dolphins must make frequent trips to the surface of the water to catch a breath.

Detailed explanation-5: -A majority of aquatic animals like fish and prawns breathe through special organs called gills. Gilla are projections of the skin that help in using oxygen dissolved in water. Gills contain blood vessels which help in exchange of gases.