Anything with radial symmetry usually lacks a brain. Sea cucumbers, along with other members of the P. Echinodermata (i.e. starfish, brittle stars, sea urchins, sand dollars), do not have a brain but rather a network of nerves.
Hope this helps!|||Not just echinoderms.|||Yup. It's just Ganglia|||Yes...sea cucumbers do not have a brain.|||aha do they swim?
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