Identify the respiratory organ in fishes that help in taking up the dissolved oxygen.
A
Lungs
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B
Gills
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C
Spiracles
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D
Skin
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Solution
The correct option is B Gills Fishes live in aquatic environments and in such environments oxygen is present in the dissolved form. Fishes take in water through their mouths and force it past through the gills where the dissolved oxygen is taken up by the blood in the capillaries.