What is the significance of the movements of the bottom of the mouth in the life of the frog.

It’s all about the anatomical structure of the frog. If we look at a person or many other animals that breathe air, then we will see a rib cage made of bones and muscles. They are able to change the volume of the chest and due to this, gas exchange occurs, since the lungs themselves cannot expand. Frogs have no ribcage. They use the ability of the oral cavity to ventilate the lungs. Frogs open their mouths and change the pressure in the lungs. This is how air enters and leaves the lungs through the nostrils.