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| Description: Two gill arches with filaments Countercurrent flow of water and blood gill arch respiratory surface fold with a capillary bed inside gill oxygen-poor blood oxygenated blood from deep in body back toward body Picture Stats: Views: 69 Filesize: 257.31kB Height: 658 Width: 1396 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47478 |