Question

Which of the following animals use gills to breathe?

• A. tracheae
• B. gills
• C. Humans
• D. Earth Worms

Answer 1

The correct option is A

tracheae

Fish breathe through their gills. Gills are respiratory organs richly supplied with 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 diffuses into the blood and travels to the cells of the fish. Amphibians like frogs breathe through their lungs on land and moist skin underwater. Earthworms breathe through their moist skin while most of the land animals including humans breathe through their lungs.