Q. 53.9( 10 Votes )
B. take in oxygen dissolved in water.
C. absorb nutrients present in water.
D. release waste substances in water.
Different organisms have different respiratory organs. In humans it is the lungs while in the aquatic animals like fishes it is the gills. Gills are actually the projections of the skin which are richly supplied in blood vessels. They help in taking the oxygen which is dissolved in water. Afterwards the process of respiration takes place.
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