which animal has no brain or nervous tissue
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Explanation:
hydra
hydraThe nervous system in hydra is made up of nerve cells joined and spread in its whole body in the form of a network. This network of nerve cells connect sensory photoreceptors and touch sensitive nerve cells present in the tentacles that help in adjusting to the environment. It does not have a brain.
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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
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