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Question

Which of the following is the respiratory organ present in fishes?

A
Lungs
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B
Trachea
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C
Heart
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D
Gills
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Solution

The correct option is D Gills
The respiratory organ present in fishes are known as gills. They breathe air that is dissolved in water through gills. Gills are well supplied with blood vessles for exchange of gases. When water passes over the gills, the dissolved oxygen in the water rapidly diffuses across the gills into the bloodstream.

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