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| Animals | Morphological features |
| $(i)$ Crocodile | $4$-chambered heart |
| $(ii)$ Sea urchin | Parapodia |
| $(iii)$ Obelia | Metagenesis |
| $(iv)$ Lemur | Thecodont |
| Column $A$ | Column $B$ | Column $C$ |
| $(1)$ Planaria | $(a)$ Planula | $(e)$ Ostia |
| $(2)$ Hyalonema | $(b)$ Pseudocoelomate | $(f)$ Flame cells |
| $(3)$ Hydra | $(c)$ Platyhelminthes | $(g)$ Polyp |
| $(4)$ Wuchereria | $(d)$ Porifera | $(h)$ Aschelminthes |
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