Champo and Wampo are twin frogs. Champo lives on the ground whereas Wampo lives in the pond. Champo wonders how Wampo respires in water. He thinks Wampo carries an oxygen cylinder like scuba divers. On the other hand Wampo wonders how Champo survives on land. He thinks Champo carries an oxygen cylinder like the mountaineers. Do you think their assumption is right?
Respiration is a crucial activity for the survival of living organisms. Respiration is defined as the transport of oxygen from the outside air to the cells within the tissues, and the transport of carbon dioxide to the atmosphere. On land, organisms take oxygen directly from the air. Though the air consists of many other gases and impurities but the body is designed specifically to absorb oxygen from the air breathed in. So, Champo takes the oxygen necessary for respiration directly from the air and not through oxygen cylinders as Wampo thinks.
In water, the mechanism of respiration is a bit different. In water organisms breathe the oxygen dissolved in water. Organisms take in the water containing dissolved oxygen through "gills” where oxygen is absorbed by the body and rest of the water is drained out. So, Wampo respires through this mechanism and not through any oxygen cylinder as Champo thinks.