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 association between two organisms in which one…Which of the following structures is used for…The substances recycled in the soil by the…Gaseous exchange occurs through the following…Which of the following factors may not affect living…