How do animals brethe

Bony Fish

• Water enters the gill chamber through a fishes mouth and exits through the gills openings under the operculum blood flowing through the gills filaments absorbs oxygen from the wate
• Some species of bony fish can absorbs considerable amounts of oxygen through their skin

Mollusk

• Almost all mollusks breath through their aid of ctenidia
• These are covered with small hairlike structures called cilia.