Fish breathe with the help of gills which are richly supplied with blood vessels. The gills help the fish to

Question

$\begin{array}{1 1} (a)\; \text{Take in oxygen from air} \\ (b)\; \text{Take in oxygen dissolved in water} \\ (c)\; \text{Absorb nutrients present in water} \\ (d)\; \text{Release waste substances in water} \end{array}$