Do Cnidarians have brains

Answer 1

They don't technically have a brain. Echinoderms have a simple radial nervous system with a nerve net, like in jellyfish but different. The nerve net has no central brain, although there may be ganglia present.

Answer 2

no

---

Well, some do have complex circular ganglia. The cubozoans (box jellies) also have the ability to sense their environment and react to it, and possibly even use their complex eyes to persue prey and avoid obstacles. Whether their nervous system is complex enough to function at the level of a simple mammalian brain is open to debate, but the term, brain, usually connotes a discrete organ rather than a radially symetric nervous system.

On the other hand, the true jellies (scyphozoans), have a very simple circular nerve network lacking complex ganglia. It could hardly be defined as a brain, yet it at least suffices to influence feeding behavior depending on satiation.

Answer 3

No, instead they have a nerve net