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:Which of the following structures is used for…The association between two organisms in which one…JSS 2 First Term Agricultural Science Lesson Note -…Micro-organisms which break down dead organisms and…Which of the following factors does not affect the…