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B
Trachea
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C
Book lungs
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D
Keber's organ
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Solution
The correct option is D Ctenidia
Ctenidium is the respiratory organ. This organ is found in the organisms which belong to the group of molluscs. The organ possesses the shape of a comb. There are many filaments which protrude out from the centre of the organ. This organ is held in the mantle. The process of gas exchange occurs with the help of this organ.