| Column-$I$ | Column-$II$ |
| $(p)$ Sponges | $(I)$ Through tracheal tubes |
| $(q)$ Insects | $(II)$ Through lungs |
| $(r)$ Molluscs | $(III)$ Vascularized gills |
| $(s)$ Reptiles | $(IV)$ Simple diffusion over their entire body surface |
| $(V)$ By their moist cuticle |
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| Column-$I$ | Column-$II$ |
| $i$. Planaria | $a$. Book gills |
| $ii$. Limulus | $b$. External gills |
| $iii$. Turtles | $c$. Body surface |
| $iv$. Amphibian tadpoles | $d$. Cloaca |
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