Concept:Gills are the respiratory organs of fish. They absorb dissolved oxygen from water for breathing underwater.
Animal
Respiratory organ
Silverfish
Trachea
Scorpion
Book lung
Sea squirt
Pharyngeal gills
Fish
Gills
Explanation:Fish continuously take water into their mouth. This water passes over the gill bars and flows through the gill filaments. Each filament has thin, disc-like lamellae with many capillaries. Oxygen dissolved in water diffuses into the blood. Carbon dioxide is released into the water. Thus, gills allow fish to extract oxygen from water, not from air or for nutrient absorption or waste excretion.Answer:C. absorb dissolved oxygen from water