Fill in the table “Comparative characteristics of flat, round and annelids”
| October 30, 2020 | Education
| Signs | Flat worms | Round worms | Annelids |
| Symmetry type | Bilateral | Bilateral | Bilateral |
| Number of body layers | Double layer | Double layer | Three-layer |
| Features of the skin-muscle bag | there is | No | there is |
| Body segmentation | No | No | there is |
| The presence of a body cavity | No | Primary | Secondary |
| The presence of the hindgut and anus | No | there is | there is |
| Features of the excretory system | Protonephridia | Protonephridia | Metonephridia |
| Features of the nervous system | Nerve pillars | Nerve pillars | Periopharyngeal nerve ring and abdominal nerve cord |
| Availability
circulatory system |
No | No | Yes, closed |
| Divided or hermaphrodite | Hermaphrodites | Dioecious | Hermaphrodites |
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