| Invertebrate Neural System | Vertebrate Neural System |
|---|---|
| $1$. The most primitive neural system is observed in $Hydra$, which is in the form of a nerve net. | $1$. The structural and functional unit of the neural system is the neuron. |
| $2$. It is highly developed in insects, consisting of ganglia and brain-like structures. | $2$. It is organized into a Central Neural System $(CNS)$ and a Peripheral Neural System $(PNS)$. |
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