1.

Define the words 1. Gills2. Carbon dioxide

Answer»
gills are present in fishes which they used for respiration 
Carbon dioxide is a colourless odourless gas produced by burning carbon and its compounds and it is usually present in air and is absorbed by plants during photosynthesis. 

  • Carbon dioxide : It is the gas that released in respiration
  • Gills : These are the respiratory organs in aquatic animals like fishes.


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