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| Description: A flatworm such as a planarian has a ladderlike nervous system with two nerve cords and a pair of ganglia in the head.
Picture Stats: Views: 98 Filesize: 169.42kB Height: 846 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47701 Keywords: Examples of invertebrate nervous systems |