Question
Why are the classification systems changing every now and then?
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| | Column I | Column II | |
| A. | Porifera | i. | Canal system |
| B. | Aschelminthes | ii. | Water-vascular system |
| C. | Annelida | iii. | Muscular pharynx |
| D. | Arthropoda | iv. | Jointed appendages |
| E. | Echinodermata | v. | Metameres |