Siphons and gills are structures in aquatic organisms used for? By: Sunday|Published on: May 15|Categories: 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 pairs of structures in living…Gaseous exchange occurs through the following…The following organisms have structures for movement except?Which of the following is not an aquatic habitat?Which of the following factors is not associated…SEE ALSO Plants which can survive in extremely dry places are called?