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| Description: When one set of valves is open, the other set is closed Picture Stats: Views: 224 Filesize: 363.83kB Height: 480 Width: 645 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=41014 |
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| Description: When one set of valves is open, the other set is closed Picture Stats: Views: 224 Filesize: 363.83kB Height: 480 Width: 645 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=41014 |