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Instead of a brain, corals have a basic nerve system that aids in their ability to respond to their surroundings.
Although flatworms lack a genuine brain to coordinate reactions, they do have ganglia and a nerve net.
Comb jellies do not have a centralized brain; instead, they move via a distributed nerve net.
Sponges have no brains; their basic needs are met by the flow of water via their pores.
Instead of a brain, sea anemones respond to their environment through a network of nerves.
Instead of a brain, jellyfish use a nerve net to sense and react to their surroundings.