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| Description: Cnidarians such as Hydra have a nerve net, but no ganglia or brain to receive and integrate information from multiple neurons Picture Stats: Views: 137 Filesize: 252.54kB Height: 1500 Width: 1138 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47700 Keywords: Examples of invertebrate nervous systems |