Discussion
The function of gills in the fish is to
Answer: C
Gills absorb dissolved oxygen from water.
Fish take in water through the mouth and pass it over the gills. The gills have thin filaments richly supplied with blood vessels, through which oxygen dissolved in the water diffuses into the blood and carbon dioxide diffuses out.
Fish do not take in oxygen from air; that is the role of lungs in land animals. Nutrients are absorbed in the intestine, not the gills. Although some wastes such as ammonia do pass out through the gills, their main function is gaseous exchange.
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