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| (a) | In Urochordata notochord extends from head to tail and it is present throughout their life. |
| (b) | In Vertebrata notochord is present during the embryonic period only. |
| (c) | Central nervous system is dorsal and hollow. |
| (d) | Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata. |
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