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:The diagram above is an illustration of organisms in…In the diagram, the structures used for offense and…Which of the following factors may not affect living…Which of the following pairs of structures in living…Which of the following factors does not affect the…