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Outside of chordates, the brain is very rare. All plants, all fungi, all arthropods, all unicellular organisms do not have a brain. Unless octopuses have brains. For the rest, at best, you can talk about a ganglion – a nerve node in the head.
There are many such examples. For example, the mold polycephalum, would seem to be a simple organism, but in a scientific experiment with a maze, it orders subject logic! Or take the classification of worms, that is, there is no brain as such, but there are other mechanisms that affect the motor skills of actions.