Mechanisms of Breathing in Different Animal Groups

Which animals exchange O2 with CO2 by simple diffusion over their entire body surface?

What do most aquatic arthropods and molluscs use for the exchange of gases?

How do reptiles, birds, and mammals respire?

Which group of animals can respire through their moist skin?

Which structures do insects use to transport atmospheric air within the body?

How do lower invertebrates like sponges exchange O2 with CO2?

What respiratory structures are used by terrestrial forms for the exchange of gases?

How do most aquatic arthropods and molluscs exchange gases?

In which group of animals can frogs respire through their moist skin?