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Define the words 1. Gills 2. Carbon dioxide

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Define the words 

1. Gills

2. Carbon dioxide

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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. 

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  • 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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