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:In the diagram, the structures used for offense and…Which of the above structures is correctly matched…Which of the following pairs of structures in living…JSS 2 First Term Agricultural Science Lesson Note -…The study which involves the inter-relationship…