7 animals that do not have brain

Jellyfish: They are simple, gelatinous creatures that lack a central nervous system or brain. They rely on a nerve net to detect changes.

Earthworm: They do not have a brain but possess a nerve cord that runs along their body.

Hydra: They are freshwater organisms that lack a centralized brain. They have a simple nerve net that helps them sense and respond to stimuli in their environment.

Starfish: They do not have a brain but they have a nerve ring around their mouth and radial nerves that extend into each arm, allowing them to coordinate movement 

Corals: They are marine invertebrates that lack a brain. They have a simple nerve net and use tentacles to capture food and sense their surroundings.

Sea anemones: They are simple animals without a brain. They have a nerve net and sensory cells that help them detect prey and navigate their environment.

Sea lilies: They possess a decentralized nerve net and a nerve ring around their mouth that helps in coordinating their movements and responses.

This information is not DNA's opinion but obtained from media reports