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| $(a)$ $6-15$ pairs of gill slits | $(i)$ $Trygon$ |
| $(b)$ Heterocercal caudal fin | $(ii)$ $Petromyzon$ |
| $(c)$ Air bladder | $(iii)$ $Chondrichthyes$ |
| $(d)$ Poison sting | $(iv)$ $Osteichthyes$ |
| Animals | Morphological features |
| $(i)$ Crocodile | $4$-chambered heart |
| $(ii)$ Sea urchin | Parapodia |
| $(iii)$ Obelia | Metagenesis |
| $(iv)$ Lemur | Thecodont |
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