What animals have no brain?
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. A brain is basically what results when a large group of nerve cells called neurons form one large cluster.
What animal has no brain and no blood?
Starfish
Starfish, also known as Sea Stars, are one of the most beautiful looking animals in the vast ocean. They have a surprisingly unusual anatomy, with no brain or blood, yet are able to digest food outside their body.
What animal has no spine heart or brain?
Jellyfish don’t have brains They don’t have a heart, lungs or a brain either! So how does a jellyfish live without these vital organs? Their skin is so thin that they can absorb oxygen right through it, so they don’t need lungs.
What animals do not have a brain?
There are many animals which does not have brain. corals and jellyfish (Cridarians) are just tow animals that have no brain. In adition echinoderms such as starfish , sea urchins, sand dollars, etc. are also have no brain.
What animal has no nervous system?
The only multicellular animals that have no nervous system at all are sponges and microscopic bloblike organisms called placozoans and mesozoans. The nervous systems of ctenophores (comb jellies) and cnidarians (e.g., anemones, hydras, corals and jellyfishes) consist of a diffuse nerve net.
What do animals do not have brains?
Jellyfish. The jellyfish family tree it’s called “jellies”.
Which animal has the smallest brain in the world?
The animal with the smallest brain/body ratio of any vertebrate is the bony-eared assfish. (No, really. It’s a type of eel). As for the smallest brain overall, it’s likely some sort of roundworm or other very primitive worm.