Siphons and gills are structures in aquatic organisms used for? by Sunday | May 15 | Biology WAEC | 0 comments A. gaseous exchange B. buoyancy C. excretion D. movement Correct Answer: Option A A. gaseous exchange Users Also Read These:Which of the following factors does not affect the…Gaseous exchange occurs through the following…Which of the following organisms are the producers…Which of the following pairs of structures in living…In the diagram, the structures used for offense and…