Question -
Aquatic animals use dissolved _________ in water for respiration.
Options:
A .  salts
B .  oxygen
C .  nitrogen
D .  carbon dioxide
Answer: Option B : B Aquatic animals use the oxygendissolvedin water for respiration. A majority of aquatic animals like fish and prawns breathe through special organs called gills. Gillsare projections of the skin that help in using oxygen dissolved in water.
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