How do starfish live and move without a brain?

Starfish is a member of phylum Echinodermata. Echinoderms do not have a centralized brain. They have a complex radial nervous system that is spread across their body. read more

Some starfish use this water system to open the shells of shell fish like mussels – the stomach of the starfish can then leave it’s body to capture the prey! They have a network of nerves – sensitive to light, temperature, and the water around them (the levels of pollution for example). read more

For example, jellyfish are interesting sea creatures that have managed to survive on Earth for around 650 million years without a brain, heart, or blood. Some of the other animals that survive without brains include the sea star, sea cucumber, sea lily, sea urchin, sea anemone, sea squirt, sea sponge, coral, and Portuguese Man-O-War. read more