| D | Complex reproductive | Reproductive. | Digestive.
| e | Organs. Supra-oes. | |
| v | Ganglion and cords. | |
| e | Sense organs. | |
| l | Body wall.ns. | |
| o | | |
| p | | |
-------------+---|------------------------+---------------+--------------
Annelid. | O | Perivisceral Cavity. | |
| r | Intestine. Circulatory | |
| g | system. Nephridia. | |
| a | Visual eyes. | |
| n | | |
| s | | |
-------------+---+------------------------+---------------+--------------
Primitive | Notochord. Fins. | |
Vertebrate. | | |
-------------+----------------------------+---------------+--------------
Fish. | Backbone (incomplete). | Digestive. | Muscles.
| Paired Fins. Jaws from | |
| Branchial Arches.
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