Read the following statements and choose the following option: 1. Lower invertebrates like coelenterate exchange O2 with CO2 through gills 2. Gills are used by most earthworms for respiration 3. Earthworms use their moist cuticle and insects have a network of tubes to transport atmospheric air within the body 4. Among vertebrates, fishes use gills whereas amphibians, reptiles, birds and mammals respire through lungs

Step-by-step solution

Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange O2 with CO2 by simple diffusion over their entire body surface. Earthworms use their moist cuticle and insects have a network of tubes (tracheal tubes) to transport atmospheric air within the body. Special vascularised structures called gills (branchial respiration) are used by most of the aquatic arthropods and molluscs whereas vascularised bags called lungs (pulmonary respiration) are used by the terrestrial forms for the exchange of gases