Which of the following has the most primitive respiratory system? by Sunday | Jun 29 | Biology WAEC | 0 comments A. Rat B. Fish C. Toad D. Grasshopper E. Lizard Correct Answer: Option D – Grasshopper Users Also Read These:SS2 First Term Biology Lesson Note – Respiratory SystemThe respiratory organ found in the cockroach is the?The respiratory structures of insects are?One primitive feature of the coelenterates is the…SS 2 Second Term Agricultural Science Lesson Note -…