Q. $O_{2}$ exchange with $CO_{2}$ by simple diffusion over the entire body surface takes place in I. sponges II. Coelenterates III. Flatworms Select the correct option to complete the given statement
A) I and II
B) II and III
C) I and III
D) All of the above
Explanation
Mechanism of breathing varies among the different groups of animals depending mainly on their habitats and level of organization. Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange of $O_{2}$ with $CO_{2}$ by simple diffusion over their entire body surface
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.