Fill in the table “Comparative characteristics of pond snail, toothless and squid”
| October 30, 2020 | Education
| Signs | Pond snail | Toothless | Squid |
| Habitat | Freshwater body | Freshwater body | Sea body |
| Lifestyle | Sedentary | Sedentary | Mobile |
| Symmetry type | Asymmetric | Bilateral | Bilateral |
| The presence of body parts a) head
b) torso c) legs |
+ + + | – + + | + + + |
| The presence of the mantle | there is | there is | there is |
| Availability
shell and its shape |
Yes, spirally wound | Yes, sash | No |
| Presence of eyes | there is | No | there is |
| Type of circulatory system | Open | Open | Semi-closed |
| Having a heart | there is | there is | there is |
| Respiratory organ | Breathing hole | Gills | Breathing hole |
| Features of the nervous system | Nerve nodes, nerves | Nerve nodes, nerves | Nerve nodes, nerves |
| Hermaphrodite or dioecious organism | Hermaphrodite | Dioecious | Dioecious |
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.