An organism X having breathing organs A lives on land. When organism X goes under water, it cannot survive for a long time unless carrying an oxygen cylinder. On the other hand, the organism Y having breathing organs B always lives in water and if taken out of water, it dies after a short while. A third organism Z having breathing organs C and D which lives on the banks of ponds, lakes and rivers can survive on land as well as in water equally well.
  1. What could organism X be? Name the breathing organs A.
  2. What could organism Y be? Name the breathing organs B.
  3. What could organism Z be? Name the breathing organs C and D.
  4. Out of X, Y and Z, which organism is.
  1. Amphibian,
  2. Aquatic,
  3. Terrestrial?
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  1. Organism X could be a human being. The breathing organs A are lungs.
  2. Organism Y could be a fish. The breathing organs B are gills.
  3. Organism Z could be a frog. The breathing organ C is skin and D are lungs.
  4.  
  1. Z is an amphibian.
  2. Y is an aquatic organism.
  3. X is a terrestrial organism.
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