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 substances recycled in the soil by the…The association between two organisms in which one…The following organisms have structures for movement except?The study which involves the inter-relationship…Which of the following factors does not affect the…